Galaxy timeline sources

	A	B	C	D	F	G
1	Year	For timeline chart	For log version		Event	Source
2
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4
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6	-13770000000	-13770000000	0	-1	Universe begins	https://en.wikipedia.org/wiki/Age_of_the_universe
7		-13769999999	1	1
8		-3770000001	9999999999	1
9	-3770000000	-3770000000	10000000000	-1	First life on earth	https://en.wikipedia.org/wiki/Earliest_known_life_forms
10		-3769999999	10000000001	1
11		-521000001	13248999999	1
12	-521000000	-521000000	13249000000	-1	First brains	https://en.wikipedia.org/wiki/Evolution_of_the_brain
13		-520999999	13249000001	1
14		-3300001	13766699999	1
15	-3300000	-3300000	13766700000	-1	First tool use	https://www.bbc.com/news/science-environment-32804177
16		-3299999	13766700001	1
17		-10001	13769989999	1
18	-10000	-10000	13769990000	-1	Start of human civilization / neolithic revolution	https://en.wikipedia.org/wiki/Neolithic_Revolution#:~:text=The%20Neolithic%20Revolution%2C%20or%20the,an%20increasingly%20large%20population%20possible.
19		-9999	13769990001	1
20		1542	13770001542	1
21	1543	1543	13770001543	-1	Scientific Revolution	https://en.wikipedia.org/wiki/Scientific_Revolution
22		1544	13770001544	1
23		1887	13770001887	1
24	1888	1888	13770001888	-1	First computer	https://en.wikipedia.org/wiki/Computer#First_computing_device
25		1889	13770001889	1
26		1944	13770001944	1
27	1945	1945	13770001945	-1	First programmable, electronic, general-purpose digital computer.	https://en.wikipedia.org/wiki/ENIAC
28		1946	13770001946	1
29		1956	13770001956	1
30	1957	1957	13770001957	-1	First space travel	https://en.wikipedia.org/wiki/Human_spaceflight#History
31		1958	13770001958	1
32		2099	13770002099	1
33	2100	2100	13770002100	-1	Space expansion starts - Holden's view	(Assumption - see post)
34		2101	13770002101	1
35		102020	13770102020	1
36	102021	102021	13770102021	-1	Space expansion starts - "conservative" view	(Assumption - see post)
37		102022	13770102022	1
38		1439822099	15209822099	1
39	1439822100	1439822100	15209822100	-1	Galaxy-wide expansion complete	See "Time to expand across galaxy" sheet
40		1439822101	15209822101	1
41		27539999999	41309999999	1
42	27540000000	27540000000	41310000000	-1	Arbitrary endpoint for chart
43		27540000001	41310000001	1
44		999999999999	1013769999999	1
45	1000000000000	1000000000000	1013770000000	-1	Star formation no longer viable	https://en.wikipedia.org/wiki/Future_of_an_expanding_universe
46		1000000000000	1013770000000	1
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