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2021 – Jun Ye and his team measure gravitational redshift with an accuracy of 7.6 × 10 −21 using an ultracold cloud of 100,000 strontium atoms in an optical lattice. [296] [297] 2021 – EHT measures the polarization of the ring of M87*, [298] and other properties of the magnetic field in its vicinity. [299]
[9] [10] [11] In the 4th century BC, Greek philosopher Aristotle taught that there is no effect or motion without a cause. The cause of the downward natural motion of heavy bodies, such as the classical elements of earth and water, was related to their nature (gravity), which caused them to move downward toward the center of the universe.
Artist's conception of Hadean Eon Earth, when it was much hotter and inhospitable to all forms of life. The first eon in Earth's history, the Hadean, begins with the Earth's formation and is followed by the Archean eon at 3.8 Ga. [2]: 145 The oldest rocks found on Earth date to about 4.0 Ga, and the oldest detrital zircon crystals in rocks to ...
Rømer compared the apparent duration of Io's orbits as Earth moved towards Jupiter (F to G) and as Earth moved away from Jupiter (L to K). 1632 – Galileo Galilei writes about the relativity of motion and that some forms of motion are undetectable; this would be later called the relativity principle , essential for special relativity as one ...
c. 16th century BCE – Mesopotamian cosmology has a flat, circular Earth enclosed in a cosmic ocean. [1]c. 15th–11th century BCE – The Rigveda of Hinduism has some cosmological hymns, particularly in the late book 10, notably the Nasadiya Sukta which describes the origin of the universe, originating from the monistic Hiranyagarbha or "Golden Egg".
This timeline lists significant discoveries in physics and the laws of nature, including experimental discoveries, theoretical proposals that were confirmed experimentally, and theories that have significantly influenced current thinking in modern physics. Such discoveries are often a multi-step, multi-person process.
The thin disk of our galaxy began to form at about 5 billion years (8.8 Gya), [13] and the Solar System formed at about 9.2 billion years (4.6 Gya), with the earliest evidence of life on Earth emerging by about 10 billion years (3.8 Gya).
Expanding relativity to cases of accelerating reference frames (the "general theory of relativity") in the 1910s, Einstein posited an equivalence between the inertial force of acceleration and the force of gravity, leading to the conclusion that space is curved and finite in size, and the prediction of such phenomena as gravitational lensing ...