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Planet Nine is a hypothetical ninth planet in the outer region of the Solar System. [4] [2] Its gravitational effects could explain the peculiar clustering of orbits for a group of extreme trans-Neptunian objects (ETNOs), bodies beyond Neptune that orbit the Sun at distances averaging more than 250 times that of the Earth i.e. over 250 astronomical units (AU).
The asteroid's provisional designation as a minor planet, "2024 YR 4", was assigned by the Minor Planet Center when its discovery was announced on 27 December 2024. [2] 2024 indicates the discovery year, the first letter, "Y", indicates that the asteroid was discovered in the second half-month of December (16 to 31 December) of that year, and "R 4" indicates that it was the 117th provisional ...
Palomar Observatory precovery images from 1989 and 1990 have extended the observation arc to 22 years. [ 7 ] With an absolute magnitude of 15.8, [ 2 ] it is one of the brightest and therefore largest potentially hazardous asteroids (PHA) detected since (242450) 2004 QY 2 . [ 8 ]
NASA images showing the expansion of a light echo around V838 Mon, between 2002 and 2004. Another accusation made by websites predicting the collision is that the US government built the South Pole Telescope (SPT) to track Nibiru's trajectory, and that the object has been imaged optically. [63]
HD 21749 c is a planet described as "likely rocky", with about 89% of Earth's diameter and orbits the K-type main sequence star HD 21749 in about 8 days. The planet's surface temperature is estimated to be as high as 427 °C. Both known planets in the system, HD 21749 b and HD 21749 c, were discovered by TESS. HD 21749 c represents the 10th ...
A NASA mission to test how living on Mars would stress and test a human crew ended Saturday, with four volunteers emerging from more than a year in a 1,700-square-foot structure.
486958 Arrokoth (provisional designation 2014 MU 69; formerly nicknamed Ultima Thule [a]) is a trans-Neptunian object located in the Kuiper belt.Arrokoth became the farthest and most primitive object in the Solar System visited by a spacecraft when the NASA space probe New Horizons conducted a flyby on 1 January 2019.
Project Mercury was the first human spaceflight program of the United States, running from 1958 through 1963. An early highlight of the Space Race, its goal was to put a man into Earth orbit and return him safely, ideally before the Soviet Union.