Titan, the moon of saturn, has an atmosphere. however, Triton has a very thin nitrogen one, and even the moon has one (thinner than that of Mercury, so it's really not that big, but it is technically an atmosphere.)
Titan orbits Saturn
Titan orbits Saturn
That is known as a moon, or as a satellite.
Mercury, the known planet that orbits closest to the sun, has no atmosphere.
Saturn. Titan is the only satellite known to have atmosphere.
The moon is a moon, also known as a natural satellite. It is not considered a planet as it orbits a planet (Earth) rather than the sun.
No, a moon is not a star. It is an object that orbits a planet or something else that is not a star. It can also be called a satellite.
Jupiter is the largest known planet which orbits the Sun.
That is known as the "atmosphere".
Assuming no typo on your part regarding the "A" satellite, it would be that the moon was the first satellite orbiting earth. If you meant "why is the moon known as a satellite", it's because it is a satellite. Anything that orbits is a satellite.
A natural celestial body that orbits a planet is called a satellite. Moons are satellites of planets. The Earth has one moon, but other planets like Jupiter and Uranus have many moons or satellites.
The planet closest to the Sun, the smallest planet, the second densest planet, it is similar in appearance to the moon, Mercury orbits around the Sun faster than any other planet, it has no moons, Mercury has no atmosphere, It was known as Apollo and Hermes in ancient times, it is highly visible just after sunset, it is also known as the swift planet.