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5th century BC – Democritus proposes that the bright band in the night sky known as the Milky Way might consist of stars. 4th century BC – Aristotle believes the Milky Way to be caused by "the ignition of the fiery exhalation of some stars which were large, numerous and close together" and that the "ignition takes place in the upper part of the atmosphere, in the region of the world which ...
First space research flight (cosmic radiation experiments). United States captured and improved V-2 rocket 24 October 1946: First pictures of Earth from 105 km (65 mi). United States V-2 [4] [5] 20 February 1947 First animals in space (fruit flies). United States V-2 [4] [6] 24 February 1949
c. 560 BCE – Anaximander is arguably the first to conceive a mechanical model of the world, although highly inaccurate: a cylindrical Earth [11] floats freely in space surrounded by three concentric wheels turning at different distances: the closest for the stars and planets, the second for the Moon and the farthest for the Sun, all conceived ...
All of the young stars appear to be no bigger than our sun. The Webb Space Telescope is marking one year of cosmic photographs with one of its best yet: the dramatic close-up of dozens of stars at ...
1929 — George Gamow proposes hydrogen fusion as the energy source for stars; 1938 — Hans Bethe and Carl von Weizsäcker detail the proton–proton chain and CNO cycle in stars; 1939 — Rupert Wildt realizes the importance of the negative hydrogen ion for stellar opacity; 1952 — Walter Baade distinguishes between Cepheid I and Cepheid II ...
They argue that these stars are hypervelocity (intergalactic) stars that were ejected from the Milky Way's Galactic Center. These stars are red giants with a high metallicity (a measure of the proportion of chemical elements other than hydrogen and helium within a star) indicating an inner galactic origin, since stars outside the disks of ...
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