Luna, the Earth's moon.
Our only moon, which is called `The Moon`. Our moons average distance from the Earth is 384,399 km (238,854 miles).
Mercury is 0.5167 AU from Earth. AU stands for astronomical unit. Mercury is 48,000,000 miles from Earth at its closest approach.
The Magnetosphere. Other layers of the Atmosphere include (In order from closest to farthest from Earth) the Troposphere, the Stratosphere, the Mesosphere, the Thermosphere, and last (but not least) the Exosphere.
The Earth is the closest body to the moon.
One astronomical unit (AU) is the distance between the Earth and the Sun.
Closest big one - all our man made satellites are closer.
Apart from the moon being an astronomical body it is very unlike the earth.
Mars
The average distance of a planet to the sun is the Semi-major axis. The furthest it gets is the Aphelion and the closest it gets is its Perihelion. The Sun to Earth Distance is also known as one Astronomical Unit (AU).
light year
No. The moon is the closest astronomical object to Earth. The closest star to Earth is the sun, which is about 400 times farther away than the moon. The next nearest star is more than 260,000 times farther away than the sun.
Neptune is the remotest of the eight planets, and its distance is 30 astronomical units, which means its distance from the Sun is 30 times the Earth's distance from the Sun.