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Mercury, the smallest and innermost planet, has no moons, or at least none that can be detected to a diameter of 1.6 km (1.0 mi). [2] For a very short time in 1974, Mercury was thought to have a moon. Venus also has no moons, [3] though reports of a moon around Venus have circulated since the 17th century.
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 ...
There have been 46 space missions to the planet Venus (including gravity-assist flybys). Missions to Venus constitute part of the exploration of Venus. The Soviet Union, followed by the United States, have soft landed probes on the surface. Venera 7 was the first lander overall and first for the Soviet Union, touching down on 15 December 1970.
Later in the same year, Norman Lockyer observed the same line in the solar spectrum, and concluded that it was caused by an element in the Sun unknown on Earth. This element is helium, which currently comprises 23.8% of the mass in the solar photosphere. [150] 1877 – Asaph Hall discovers Mars's moons Deimos and Phobos. [151]
Vostok 1 – First crewed Earth orbiter Mariner 2 – First successful Venus flyby Mariner 4 – First successful Mars flyby Luna 9 – First successful lunar lander Zond 5 – First lunar flyby and return to Earth, first terrestrials to circle the Moon Apollo 8 – First crewed lunar orbiter Apollo 11 – First crewed lunar landing
Why full moons in the night sky are worth viewing, how they got their names and other interesting lunar facts. Your guide to full moons for 2024: Supermoons, solstices, equinoxes and more Skip to ...
"On the fifth night in the month of May appeared the moon shining bright in the evening, and afterwards by little and little its light diminished."
"Two very different histories of water on Venus have been proposed: one where Venus had a temperate climate for billions of years, with surface liquid water, and the other where a hot early Venus ...