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Mercury, being the closest to the Sun, with a weak magnetic field and the smallest mass of the recognized terrestrial planets, has a very tenuous and highly variable atmosphere (surface-bound exosphere) containing hydrogen, helium, oxygen, sodium, calcium, potassium and water vapor, with a combined pressure level of about 10 −14 bar (1 nPa). [2]
Mercury is one of four terrestrial planets in the Solar System, which means it is a rocky body like Earth. It is the smallest planet in the Solar System, with an equatorial radius of 2,439.7 kilometres (1,516.0 mi). [4] Mercury is also smaller—albeit more massive—than the largest natural satellites in the Solar System, Ganymede and Titan.
Mercury, Ceres and several large natural satellites, such as the Moon, Europa, and Ganymede, have exospheres without a denser atmosphere underneath, [3] referred to as a surface boundary exosphere. [4] Here, molecules are ejected on elliptic trajectories until they collide with the surface. Smaller bodies such as asteroids, in which the ...
[39] [40] Like the asteroid belt, it consists mainly of small bodies (remnants from the Solar System's formation) and at least one dwarf planet—Pluto, which may be geologically active. [41] But while the asteroid belt is composed primarily of rock and metal , the Kuiper belt is composed largely of ices , such as methane , ammonia , and water .
The atmosphere of Earth is composed of a layer of gas mixture that surrounds the Earth's planetary surface (both lands and oceans), known collectively as air, with variable quantities of suspended aerosols and particulates (which create weather features such as clouds and hazes), all retained by Earth's gravity.
Mercury retrograde is known as a time of miscommunication and chaos. Ahead, an astrologer breaks down every time Mercury will be in retrograde in 2024.
Objects entering an atmosphere from space at high velocities relative to the atmosphere will cause very high levels of heating. Atmospheric entry heating comes principally from two sources: convection of hot gas flow past the surface of the body and catalytic chemical recombination reactions between the surface and atmospheric gases; and
The angle of the planets makes Mercury appear smaller—but it’s actually just farther away. (P.S. (P.S. There’s a crude joke in here about size not mattering, but I’m trying not to reach ...