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Mercury will reappear as a morning "star" in late June or early July 2021, EarthSky said, while Venus will remain an evening "star" through 2021. Conjunctions like the Venus-Mercury encounter are regular events in the sky as the planets line up with Earth in their respective orbits.May 28, 2021
Mars (diameter 6790 kilometers) is only slightly more than half the size of Earth (diameter 12750 kilometers). Note the difference in color between the two planets. Almost 70% of Earth's surface is covered by liquid water. In contrast, Mars now has no liquid water on its surface and is covered with bare rock and dust.
Through binoculars and wide-angle telescopes, you could see both planets at the same time, including Saturn's rings and some of Jupiter's moons. After the 21st the planets started drifting apart, and they won't be this close again until 2080.Dec 23, 2020
Uranus and Neptune have similar masses and internal compositions. Their outer atmospheres are composed of hydrogen, helium and methane, while their mantles are a combination of water, ammonia and methane ices, and their cores are a mix of rock and ice.Feb 9, 2020
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