There are loads of objects to observe in space, ranging from small comets, asteroids and meteoroids, to dwarf planets, planets and their moons, stars, other galaxies, giant gas clouds called nebulae, remains from exploded stars etc. The universe contains loads of dark matter too, this make up most of the universes mass, but has been proven very difficult to detect.
Planets but the look like stars
spacex
Liquid water. All else is incidental.
Differentiation occurred in other inner planets, besides Earth.
The space between planets is known as interplanetary space. It is mostly vacuum but can contain small amounts of particles and gases.
If they aren't in space, then where else can they be?
no because there is no oxogen in space
Planets but the look like stars
Yes, an example is asteroids.
spacex
It moves in Time, the fourth dimension.
No. Astronomy has to do with stars, planets, comets, and everything else that has to do with space. The orbits of planets, constellations, and history of space exploration is also a part of astronomy.
Liquid water. All else is incidental.
Uranus and Neptune are the biggest planets besides Saturn and Jupiter. :)
Planets, small bodies ( asteroid, comet, meteoroid) solar systems ( we live in milky way), and galaxies made of dust and small particles. We believe most galaxies have black holes (timeless area in space that pulls matter in) in the center and that makes the galaxies spin.
Yes. Like most terrestrial planets it has a core made mostly of iron.
we have outer space because what else is going to hold the planets up and not let them fall forever, that's what our sun does, and outer space holds the sun up