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c. 300 BC — star catalog of Timocharis of Alexandria. c. 134 BC — Hipparchus makes a detailed star map. c. 150 — Ptolemy completes his Almagest, which contains a catalog of stars, observations of planetary motions, and treatises on geometry and cosmology. c. 705 — Dunhuang Star Chart, a manuscript star chart from the Mogao Caves at ...
The ΛCDM model assumes that the strong equivalence principle is true. However, in 2020 a group of astronomers analyzed data from the Spitzer Photometry and Accurate Rotation Curves (SPARC) sample, together with estimates of the large-scale external gravitational field from an all-sky galaxy catalog.
However, Ibn Al Haytham agreed with the Earth being in the centre of the Solar System at a fixed position. [60] Nasir al-Din, during the 13th century, was able to combine two possible methods for a planet to orbit and as a result, derived a rotational aspect of planets within their orbits. [61]
A group of scientists at Cornell University started a catalog of microorganisms, with the way each one reacts to sunlight. The goal is to help with the search for similar organisms in exoplanets, as the starlight reflected by planets rich in such organisms would have a specific spectrum, unlike that of starlight reflected from lifeless planets.
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Caldwell catalogue. Montage of Caldwell Catalogue objects. The Caldwell catalogue is an astronomical catalogue of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. The list was compiled by Patrick Moore as a complement to the Messier catalogue. [ 1]
Qotb al-Din Mahmoud b. Zia al-Din Mas'ud b. Mosleh Shirazi (Persian: قطبالدینْ محمود بن ضیاءالدینْ مسعود بن مصلح شیرازی; 1236–1311) was a 13th-century Persian [1] [2] polymath and poet who made contributions to astronomy, mathematics, medicine, physics, music theory, philosophy and Sufism.
Prominent examples of stars in this mass range include Antares, Spica, [2] Gamma Velorum, [3] Mu Cephei, and members of the Quintuplet Cluster. [4] Type Ia supernova progenitors are white dwarf stars that are close to the Chandrasekhar limit of about 1.44 solar masses and are accreting matter from a binary companion star.