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ASTR HW 9 (Lecture 12 and 13)
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Before starting these questions, please watch Lectures 11 and 12. You must submit them at one time. The submit button is at the bottom. Please only submit once.
In the 1970s, Stephen Hawking
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made observations of radiating black holes, with the largest black holes having the lowest temperatures.
showed that, at least theoretically, black holes should radiate; the largest black holes have the lowest temperatures.
showed that, at least theoretically, black holes should radiate; the smallest black holes have the lowest temperatures.
made observations of radiating black holes, with the smallest black holes having the lowest temperatures.
In Einstein's conception of gravity (please check all that apply)
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gravity is a force.
time is measured the same way all throughout the universe.
gravity is not a force.
time can be measured very differently throughout the universe.
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Suppose that the Milky Way galaxy (the galaxy in which we live) were the size of the continental United States; our Sun would be
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about the size of the screen you're using to read this.
about the size of a small town.
about the size of the period at the end of this sentence.
about the size of an average US state.
Open clusters
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are regions, typically within the arms of spiral galaxies, where there is a lot of gas, dust, and star formation.
are regions, typically within the arms of spiral galaxies, where there is little gas and dust.
are regions, typically in the halos of spiral galaxies, where there is little gas and dust.
are regions, typically in the halos of spiral galaxies, where there is a lot of gas and dust.
⏩ FORM_TIMER_UNIQUE_IDENTIFIER
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This picture
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shows the bending of light by space--in other words, it shows space acting as a lens.
depicts a galaxy.
shows a gamma ray burst.
shows a constellation.
Einstein's model of gravity is considered closer to reality than Newton's because
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Newton's model cannot accurately predict gravitational interactions in strong gravitational fields, whereas Einstein's model has made accurate predictions in every experiment and observation that has been (so far) conducted--including in strong gravitational fields.
Newton's model can accurately predict gravitational interactions in strong gravitational fields, but not within our Solar System.
its equations are simpler.
its equations are more complicated.
In Newton's conception of gravity (please check all that apply)
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gravity is not a force.
gravity is a force.
time can be measured very differently throughout the universe.
time is measured the same way all throughout the universe.
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