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The latter was the first atlas to chart both celestial hemispheres and it introduced the Bayer designations for identifying the brightest stars using the Greek alphabet. The Uranometria contained 48 maps of Ptolemaic constellations, a plate of the southern constellations and two plates showing the entire northern and southern hemispheres in ...
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 ...
The first generation of stars, known as Population III stars, formed within a few hundred million years after the Big Bang. [49] These stars were the first source of visible light in the universe after recombination. Structures may have begun to emerge from around 150 million years, and early galaxies emerged from around 180 to 700 million years.
The Hubble Space Telescope, the first large optical telescope in orbit, is launched using the Space Shuttle, but astronomers soon discovered that it is crippled by a problem with its mirror. A complex repair mission in 1993 allows the telescope to start producing spectacular images of distant stars, nebulae, and galaxies.
c. 840 — Al-Farghani's Compendium of the Science of the Stars; c. 900 — Al-Battani's Az-Zij as-Sabi; 964 — Abd al-Rahman al-Sufi (Azophi)'s star catalog Book of the Fixed Stars; 1031 — Al-Biruni's al-Qanun al-Mas'udi, making first use of a planisphere projection, and discussing the use of the astrolabe and the armillary sphere.
Scientists expect such early collections of stars and swirling matter to be relatively small. After all, such galaxies hadn't had much time to form o Webb telescope just found massive objects that ...
Shooting stars – such as those produced by the Leonid meteor shower depicted in this print from 1889 – are beautiful, but they have nothing to do with real stars. Adolf Vollmy/Wi
A graphical view of the Cosmic Calendar, featuring the months of the year, days of December, the final minute, and the final second. The Cosmic Calendar is a method to visualize the chronology of the universe, scaling its currently understood age of 13.8 billion years to a single year in order to help intuit it for pedagogical purposes in science education or popular science.