First, dust, debris and gases, left over from the formation of the sun and the planets.
Second, gases and radiation produced by the sun (eg. solar wind).
Third, various spacecraft and other technological artifacts, shot into space by humans (eg. the Pioneers and Voyagers launched by NASA).
The planets that have the most space between them are mercury and Pluto.
Space
Everything is mostly space. The diameter of the sun is 865 thousand miles, which is a bit under a million. The radius of the earth's orbit is 93 million miles, almost 100 million. Sedna, which isn't even outside the solar system, orbits 900 times as far (currently).
Astronomy is planets and space earth science is about earth
Astronomy is the renaissance that studies the planets. They study the planets and space.
The planets that have the most space between them are mercury and Pluto.
Space
space...who are you people?
Space
Interplanetary means "between the planets".
Everything is mostly space. The diameter of the sun is 865 thousand miles, which is a bit under a million. The radius of the earth's orbit is 93 million miles, almost 100 million. Sedna, which isn't even outside the solar system, orbits 900 times as far (currently).
the space between stars and planets has insufficient particles to reflect the light back to us.
The asteroid belt is between the inner and outer planets, but mostly it is just empty space.
Between the different space programs, all of the seven other planets of our solar system have been visited, some of them several times.
If they aren't in space, then where else can they be?
There is no galaxy between the planets and the Sun - just a lot of open space.
there is no up and down in space. there is an asteroid belt in between mars and jupiter. the big band formed the planets.