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Polish astronomer Nicolaus Copernicus publishes a book suggesting that the earth moves round the sun
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Wealthy US astronomer Percival Lowell builds an observatory at Mars Hill in Flagstaff, Arizona
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The nearest star to earth, the red dwarf Proxima Centauri 4.22 light years away, is discovered by Robert Innes, Scottish director of the Johannesburg Observatory
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US astronomer Edwin Hubble proves that the nebula Andromeda is vastly further away than other stars and can only be a separate galaxy
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The sun is going to brun out
Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.