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1Best periods to observe Magellanic Clouds?http://physics.stackexchange.com/questions/24850/best-periods-to-observe-magellanic-cloudsobservation cloud
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2Do all black holes have a singularity?http://physics.stackexchange.com/questions/24934/do-all-black-holes-have-a-singularityblack-holes neutron-stars singularity
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3What does f/4.6 mean in a telescope and how important is this value?http://physics.stackexchange.com/questions/25019/what-does-f-4-6-mean-in-a-telescope-and-how-important-is-this-valuetelescopes
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4What is the typical career path to become a professional Astronomer?http://physics.stackexchange.com/questions/24944/what-is-the-typical-career-path-to-become-a-professional-astronomereducation career
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5Lenses (refractor) or mirrors (reflector) telescope?http://physics.stackexchange.com/questions/25024/lenses-refractor-or-mirrors-reflector-telescopetelescopes reflector refractor
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7What is exactly a Dobsonian, and what are the differences when compared with Schmidt-Cassegrain or Newtonian?http://physics.stackexchange.com/questions/25191/what-is-exactly-a-dobsonian-and-what-are-the-differences-when-compared-with-schtelescopes
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8Can the apparent equal size of sun and moon be explained or is this a coincidence?http://physics.stackexchange.com/questions/24912/can-the-apparent-equal-size-of-sun-and-moon-be-explained-or-is-this-a-coincidencsun moon
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10How can I judge a globular cluster on the Shapley & Sawyer scale?http://physics.stackexchange.com/questions/25159/how-can-i-judge-a-globular-cluster-on-the-shapley-sawyer-scaleglobular-clusters visual-astronomy classification
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12Which is the strongest meteor shower expected in the next years in the Northern hemisphere?http://physics.stackexchange.com/questions/24859/which-is-the-strongest-meteor-shower-expected-in-the-next-years-in-the-northernmeteor-showers
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14For observing planets what kind of telescope offers the best view?http://physics.stackexchange.com/questions/24876/for-observing-planets-what-kind-of-telescope-offers-the-best-viewvisual-astronomy eyepieces reflector refractor planets
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15Why is M42 red in the pictures, but green when observed at the eyepiece?http://physics.stackexchange.com/questions/25046/why-is-m42-red-in-the-pictures-but-green-when-observed-at-the-eyepiecenebula photography
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18Why don't modern spacecraft use nuclear power?http://physics.stackexchange.com/questions/25209/why-dont-modern-spacecraft-use-nuclear-powervoyager spacecraft exploration satellite
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21How are Cepheids used to evaluate their distance?http://physics.stackexchange.com/questions/25175/how-are-cepheids-used-to-evaluate-their-distancestars distance
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25What age to start kids with astronomyhttp://physics.stackexchange.com/questions/24919/what-age-to-start-kids-with-astronomyvisual-astronomy amateur-astronomy
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28What is the current status of Pluto?http://physics.stackexchange.com/questions/25162/what-is-the-current-status-of-plutoplanets pluto
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32What are good resources for someone looking to become an amateur astronomer?http://physics.stackexchange.com/questions/24965/what-are-good-resources-for-someone-looking-to-become-an-amateur-astronomeramateur resources
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39What objects look best in an O-III filter?http://physics.stackexchange.com/questions/24987/what-objects-look-best-in-an-o-iii-filtervisual-astronomy filters planetary-nebulae
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43Where can I find public domain astronomical pictures?http://physics.stackexchange.com/questions/24993/where-can-i-find-public-domain-astronomical-picturesnebula stars
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45A method to estimate the relative magnitude of a star using nearby starshttp://physics.stackexchange.com/questions/24942/a-method-to-estimate-the-relative-magnitude-of-a-star-using-nearby-starsmagnitude
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46Observing lunar lander and footprints on the moon?http://physics.stackexchange.com/questions/25145/observing-lunar-lander-and-footprints-on-the-moontelescopes the-moon aperture
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50Can we observe changes in the fine-structure constant?http://physics.stackexchange.com/questions/25228/can-we-observe-changes-in-the-fine-structure-constantcosmology
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63What causes millisecond pulsars to speed up?http://physics.stackexchange.com/questions/24990/what-causes-millisecond-pulsars-to-speed-upneutron-stars pulsars gamma-rays
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64How do the “hot Jupiter” planets get so close to their host star?http://physics.stackexchange.com/questions/25248/how-do-the-hot-jupiter-planets-get-so-close-to-their-host-starplanets extrasolar-planets
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74Why don't more rocky planets/moons have appreciable atmospheres?http://physics.stackexchange.com/questions/25264/why-dont-more-rocky-planets-moons-have-appreciable-atmospheresplanets atmosphere moons mercury
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78Scientific value of timing total lunar occultationshttp://physics.stackexchange.com/questions/25087/scientific-value-of-timing-total-lunar-occultationsobservation the-moon
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80What tools do I need to track an orbit of a mystery object?http://physics.stackexchange.com/questions/25157/what-tools-do-i-need-to-track-an-orbit-of-a-mystery-objectobservation equipment
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81Why can we see the cosmic microwave background (CMB)?http://physics.stackexchange.com/questions/25070/why-can-we-see-the-cosmic-microwave-background-cmbcosmology big-bang cmb
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86Why is Uranus's axis of rotation tilted?http://physics.stackexchange.com/questions/25153/why-is-uranuss-axis-of-rotation-tiltedplanets cosmology uranus orbit
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88What is Dark Energy, and how was it discovered?http://physics.stackexchange.com/questions/24869/what-is-dark-energy-and-how-was-it-discoveredphysics dark-energy
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93What is a backlit CCD sensor, and why might I prefer it to other kinds?http://physics.stackexchange.com/questions/25260/what-is-a-backlit-ccd-sensor-and-why-might-i-prefer-it-to-other-kindsastrophotography
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94What is a spectrometer, and why are they so useful in science?http://physics.stackexchange.com/questions/25181/what-is-a-spectrometer-and-why-are-they-so-useful-in-scienceinstrument
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98How important is a camera with improved Hydrogen Alpha sensitivity to astrophotography?http://physics.stackexchange.com/questions/25044/how-important-is-a-camera-with-improved-hydrogen-alpha-sensitivity-to-astrophotoastrophotography planetary-nebulae color
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99What are the pros and cons of a german equatorial mount vs. a fork mount?http://physics.stackexchange.com/questions/24857/what-are-the-pros-and-cons-of-a-german-equatorial-mount-vs-a-fork-mountequipment
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113What open-source n-body codes are available and what are their features?http://physics.stackexchange.com/questions/25241/what-open-source-n-body-codes-are-available-and-what-are-their-featuressoftware simulation
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114Do all narrowband filters tint the field of view?http://physics.stackexchange.com/questions/25133/do-all-narrowband-filters-tint-the-field-of-viewfilters observation color
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116Is there any evidence for the claim that the moon was once part of the Earth?http://physics.stackexchange.com/questions/24951/is-there-any-evidence-for-the-claim-that-the-moon-was-once-part-of-the-earthearth the-moon
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117Why does each celestial object spin on its own axis?http://physics.stackexchange.com/questions/24888/why-does-each-celestial-object-spin-on-its-own-axisgravity spin rotation
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119Resources and requirements for amateur spectroscopyhttp://physics.stackexchange.com/questions/24904/resources-and-requirements-for-amateur-spectroscopyamateur resources spectroscopy
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120Does Earth have a code name?http://physics.stackexchange.com/questions/24907/does-earth-have-a-code-namecatalog
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123Who should I contact if I see an unknown object in the sky?http://physics.stackexchange.com/questions/25185/who-should-i-contact-if-i-see-an-unknown-object-in-the-skyunknown-object
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124Is it possible to see Fraunhofer lines with amateur equipment?http://physics.stackexchange.com/questions/25105/is-it-possible-to-see-fraunhofer-lines-with-amateur-equipmentequipment spectroscopy
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125How does a spacecraft's orientation get determinedhttp://physics.stackexchange.com/questions/25244/how-does-a-spacecrafts-orientation-get-determinedspacecraft
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126After the Space Shuttle is retired, how will the new sections of ISS will be launched?http://physics.stackexchange.com/questions/25137/after-the-space-shuttle-is-retired-how-will-the-new-sections-of-iss-will-be-laushuttle launch
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127How can a black hole emit X-rays?http://physics.stackexchange.com/questions/24958/how-can-a-black-hole-emit-x-raysblack-holes gravity
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135Scopes to avoid as a beginner?http://physics.stackexchange.com/questions/25052/scopes-to-avoid-as-a-beginnertelescopes beginner advice
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138Why are orbits elliptical?http://physics.stackexchange.com/questions/25110/why-are-orbits-ellipticalorbit planetary-motion gravitation
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152When taking a sequence of exposures for stacking/coaddition, what dither patterns are most commonly desired? Why?http://physics.stackexchange.com/questions/24973/when-taking-a-sequence-of-exposures-for-stacking-coaddition-what-dither-patterntelescopes observation software
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154Optimal Angular Field of View (AFOV)http://physics.stackexchange.com/questions/25120/optimal-angular-field-of-view-afovtelescopes eyepieces
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155How to determine what size telescope to buyhttp://physics.stackexchange.com/questions/25123/how-to-determine-what-size-telescope-to-buytelescopes optics
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156What allows the modified Urca process to work at lower density than direct Urca in neutron star cooling?http://physics.stackexchange.com/questions/25151/what-allows-the-modified-urca-process-to-work-at-lower-density-than-direct-urcaastrophysics neutron-stars
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157Can any telescope be used for solar observing?http://physics.stackexchange.com/questions/25198/can-any-telescope-be-used-for-solar-observingtelescopes sun solar
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169What are the prerequisites for considering any other planet to be habitable?http://physics.stackexchange.com/questions/25064/what-are-the-prerequisites-for-considering-any-other-planet-to-be-habitableplanets planetary-habitability
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177When will the Moon reach escape velocity?http://physics.stackexchange.com/questions/25252/when-will-the-moon-reach-escape-velocityearth the-moon
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180How to nail focus for DSLR astrophotography?http://physics.stackexchange.com/questions/25098/how-to-nail-focus-for-dslr-astrophotographyastrophotography focus
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183Why does the moon sometimes appear giant and a orange red color near the horizon?http://physics.stackexchange.com/questions/25254/why-does-the-moon-sometimes-appear-giant-and-a-orange-red-color-near-the-horizonmoon
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186Ways of verifying the origin of a meteorite?http://physics.stackexchange.com/questions/25188/ways-of-verifying-the-origin-of-a-meteoritemeteorite the-moon
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188Seeing cosmic activity now, really means it happens millions/billions of years ago ?http://physics.stackexchange.com/questions/25205/seeing-cosmic-activity-now-really-means-it-happens-millions-billions-of-years-adistance time light-years
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195What criteria were used to set the "useme" flag in the NOMAD astrometric catalog?http://physics.stackexchange.com/questions/25050/what-criteria-were-used-to-set-the-useme-flag-in-the-nomad-astrometric-catalogastrometry catalog
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202What size aperature would I need to find and see the supernova in M51?http://physics.stackexchange.com/questions/25258/what-size-aperature-would-i-need-to-find-and-see-the-supernova-in-m51visual-astronomy amateur aperture supernova
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206How dark does it have to be to see the gegenschein?http://physics.stackexchange.com/questions/24949/how-dark-does-it-have-to-be-to-see-the-gegenscheindust
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208Is the length of the day increasing?http://physics.stackexchange.com/questions/25221/is-the-length-of-the-day-increasingearth sun
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210How can a spiral galaxy exist?http://physics.stackexchange.com/questions/25128/how-can-a-spiral-galaxy-existastrophysics galaxy
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211Are there websites or programmes that permit a simulation of the night sky in the past and the future on an ordinary computer?http://physics.stackexchange.com/questions/25008/are-there-websites-or-programmes-that-permit-a-simulation-of-the-night-sky-in-thsoftware constellations
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213Is there a good explanation for the observation of Martian canals?http://physics.stackexchange.com/questions/24863/is-there-a-good-explanation-for-the-observation-of-martian-canalsmars water
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217How can the Earth's day increase and its rotation slow down at the same time?http://physics.stackexchange.com/questions/24917/how-can-the-earths-day-increase-and-its-rotation-slow-down-at-the-same-timeearth rotation
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222What makes a good set of binoculars?http://physics.stackexchange.com/questions/24984/what-makes-a-good-set-of-binocularsequipment
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223Observing Jupiter's non-Galilean moonshttp://physics.stackexchange.com/questions/25073/observing-jupiters-non-galilean-moonstelescopes moons jupiter solar-system
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224How many stars are in the Milky Way galaxy, and how can we determine this?http://physics.stackexchange.com/questions/25131/how-many-stars-are-in-the-milky-way-galaxy-and-how-can-we-determine-thisgalaxies milky-way
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225Why are there more lunar maria on the near side than on the far side?http://physics.stackexchange.com/questions/24981/why-are-there-more-lunar-maria-on-the-near-side-than-on-the-far-sidethe-moon
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232What is the probability that a star of a given spectral type will have planets?http://physics.stackexchange.com/questions/24866/what-is-the-probability-that-a-star-of-a-given-spectral-type-will-have-planetsplanets exoplanets
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237Collision of charged black holeshttp://physics.stackexchange.com/questions/24923/collision-of-charged-black-holesblack-holes
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238What to cite for MSX6 survey?http://physics.stackexchange.com/questions/24932/what-to-cite-for-msx6-surveyresources
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240How do you respond to questions like "Have you ever observed a UFO?"http://physics.stackexchange.com/questions/25169/how-do-you-respond-to-questions-like-have-you-ever-observed-a-ufoobservation spacecraft unknown-object
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244What is meant when it is said that the universe is homogeneous and isotropic?http://physics.stackexchange.com/questions/24881/what-is-meant-when-it-is-said-that-the-universe-is-homogeneous-and-isotropiccosmology universe
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245How large is the universe?http://physics.stackexchange.com/questions/25076/how-large-is-the-universecosmology big-bang special-relativity light universal-expansion
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246What kind of telecommunication systems do astronauts use in space?http://physics.stackexchange.com/questions/24953/what-kind-of-telecommunication-systems-do-astronauts-use-in-spaceastronaut
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247What's the best way to watch meteor showers?http://physics.stackexchange.com/questions/25236/whats-the-best-way-to-watch-meteor-showersmeteor-showers
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248The most distant point from the earth that a space shuttle could reach till nowhttp://physics.stackexchange.com/questions/25059/the-most-distant-point-from-the-earth-that-a-space-shuttle-could-reach-till-nowdistance shuttle space-flight
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258In what ways can a lunar eclipse occur?http://physics.stackexchange.com/questions/25061/in-what-ways-can-a-lunar-eclipse-occurthe-moon eclipse
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266How do air cherenkov telescopes work?http://physics.stackexchange.com/questions/25067/how-do-air-cherenkov-telescopes-workgamma-rays telescopes instruments
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271How does atmospheric seeing evolve over time?http://physics.stackexchange.com/questions/25219/how-does-atmospheric-seeing-evolve-over-timeobservation seeing weather
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273What are the various kinds of Cassegrain telescopes, and what benefits and drawbacks does each have?http://physics.stackexchange.com/questions/24852/what-are-the-various-kinds-of-cassegrain-telescopes-and-what-benefits-and-drawboptics telescopes
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280Why is the Ritchey–Chrétien telescope preferred in professional astronomy?http://physics.stackexchange.com/questions/24979/why-is-the-ritcheychretien-telescope-preferred-in-professional-astronomyoptics telescopes professional-astronomy
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285Smaller free remote control telescopes?http://physics.stackexchange.com/questions/25233/smaller-free-remote-control-telescopestelescopes
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286What is the name of our Galaxy?http://physics.stackexchange.com/questions/25140/what-is-the-name-of-our-galaxygalaxy
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289What is a decent beginner's camera for astrophotography?http://physics.stackexchange.com/questions/25224/what-is-a-decent-beginners-camera-for-astrophotographyastrophotography
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292What is an asterism compared to a constellation?http://physics.stackexchange.com/questions/25082/what-is-an-asterism-compared-to-a-constellationconstellations
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297What does the sky look like to human eyes from orbit?http://physics.stackexchange.com/questions/25038/what-does-the-sky-look-like-to-human-eyes-from-orbitvisual-astronomy orbit
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306Binary stars' apparent magnitudehttp://physics.stackexchange.com/questions/25215/binary-stars-apparent-magnitudestars apparent-magnitude
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308What's dark matter and who discovered it?http://physics.stackexchange.com/questions/25194/whats-dark-matter-and-who-discovered-itcosmology astrophysics galaxies dark-matter
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314What latitude is needed before you can reliably see Omega Centauri?http://physics.stackexchange.com/questions/24999/what-latitude-is-needed-before-you-can-reliably-see-omega-centaurivisual-astronomy globular-clusters
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319How to convert a FITS file to .xls Excel file?http://physics.stackexchange.com/questions/24969/how-to-convert-a-fits-file-to-xls-excel-fileastrophotography fits-files
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320What is the most distant object from the Earth that a spacecraft has visited to date?http://physics.stackexchange.com/questions/24873/what-is-the-most-distant-object-from-the-earth-that-a-spacecraft-has-visited-tospacecraft space-flight nasa
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321How does a comet form?http://physics.stackexchange.com/questions/25149/how-does-a-comet-formcomet
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324How do you clean a dusty lens?http://physics.stackexchange.com/questions/24892/how-do-you-clean-a-dusty-lenstelescopes equipment
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336Mixing and matching across eyepiece designs / manufacturers?http://physics.stackexchange.com/questions/25033/mixing-and-matching-across-eyepiece-designs-manufacturersequipment amateur eyepieces
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347Are solar physics images of use to the night-time community?http://physics.stackexchange.com/questions/25118/are-solar-physics-images-of-use-to-the-night-time-communitysolar-telescopes
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348Are the Voyager probes still sending us a signal ?http://physics.stackexchange.com/questions/25262/are-the-voyager-probes-still-sending-us-a-signalvoyager
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350How are newly discovered objects (stars, planets, galaxies...) named?http://physics.stackexchange.com/questions/24975/how-are-newly-discovered-objects-stars-planets-galaxies-namedprofessional-astronomy names
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