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Phaeton (alternatively Phaethon / ˈ f eɪ. ə θ ən / or Phaëton / ˈ f eɪ. ə t ən /; from Ancient Greek: Φαέθων, romanized: Phaéthōn, pronounced [pʰa.é.tʰɔːn]) is a hypothetical planet hypothesized by the Titius–Bode law to have existed between the orbits of Mars and Jupiter, the destruction of which supposedly led to the formation of the asteroid belt (including the ...
It was initially estimated to have a much lower mass, and thus a low density of 3.3 ± 0.9 g/cm 3 and a surface gravity around 6.1 m/s 2 (62% of Earth's value). [1] This suggested a large amount of volatiles , with a 2017 study suggesting that a water ocean may comprise as much as 20% of the planet's mass, increasing the temperature at the ...
The surrounding material is blasted away (f), leaving only a degenerate remnant. [109] When a stellar core is no longer supported against gravity, it collapses in on itself with velocities reaching 70,000 km/s (0.23c), [110] resulting in a rapid increase in temperature and density. What follows depends on the mass and structure of the ...
In astrodynamics, the characteristic energy is a measure of the excess specific energy over that required to just barely escape from a massive body. The units are length 2 time −2, i.e. velocity squared, or energy per mass.
The Big Bang is a physical theory that describes how the universe expanded from an initial state of high density and temperature. [1] The concept of an expanding universe was scientifically originated by physicist Alexander Friedmann in 1922 with the mathematical derivation of the Friedmann equations.
The James Webb Space Telescope has uncovered wondrous imagery and reached numerous milestones with the latest achievement arguably its most important. On Jan. 11, NASA confirmed that researchers ...
The planet, called LHS 3154 b, orbits at about 2.3% of Earth's orbital distance from the sun, circling its star every 3.7 days. It is much closer even than our solar system's innermost planet ...
The meteorite fragments are therefore called Ribbeck meteorites. About 200 pieces were collected, totaling about 1.8 kg. The largest pieces weighed 212 g (sample F13) and 171 g (sample F14). [5] First analysis by scientists of the Natural History Museum in Berlin showed that it was an aubrite, a rare group of meteorites.