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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 planets Mercury and Venus will both cross the ecliptic at the same time. July 26, 69,163 AD A simultaneous transit of Venus and Mercury. 70,000 years Estimated time for Comet Hyakutake to return to the inner Solar System, after having travelled in its orbit out to its aphelion 3410 A.U. from the Sun and back. [159] 93,830 AD
Of the Solar System's eight planets and its nine most likely dwarf planets, six planets and seven dwarf planets are known to be orbited by at least 300 natural satellites, or moons. At least 19 of them are large enough to be gravitationally rounded; of these, all are covered by a crust of ice except for Earth's Moon and Jupiter's Io . [ 1 ]
The number of known planets in our solar system has risen and fallen over time. Planet nine may be orbiting far from the Sun, at the edge of our solar system. Astronomers, seeing odd ...
Scientists say they have found new evidence that there is a hidden planet in our solar system. For years, some astronomers have been suggesting that unusual behaviour on the edge of our solar ...
The distance separating the two planets in the sky will be less than the width of a pinky finger held out at arm's length. The planetary convergence is one of the top astronomy events of 2023.
The timeline of discovery of Solar System planets and their natural satellites charts the progress of the discovery of new bodies over history. Each object is listed in chronological order of its discovery (multiple dates occur when the moments of imaging, observation, and publication differ), identified through its various designations (including temporary and permanent schemes), and the ...
Five planets are going to be retrograde in the summer of 2024. Here are the dates for Mercury retrograde, Venus retrograde, Saturn retrograde, Neptune retrograde, Pluto retrograde and more.