Astronomy - Earth & Space

4. a scientist in the field of astronomy who focuses their studies on a specific question or field outside the scope of Earth
6. way, a spiral shaped galaxy that contains several hundred billion stars, including our Sun
8. positioned in or relating to the sky, or outer space as observed in astronomy.
9. all of space and time and their contents, including planets, stars, galaxies, and all other forms of matter and energy.
10. a luminous ball of gas, mostly hydrogen and helium, held together by its own gravity

1. it is small, rocky object that orbit the Sun.
2. an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing.
3. having or representing the earth as the centre, as in former astronomical systems. Compare with heliocentric.
4. the envelope of gases surrounding the earth or another planet
5. an optical instrument that makes distant objects appear magnified by using an arrangement of lenses or curved mirrors and lenses
7. a huge collection of gas, dust, and billions of stars and their solar systems which is held by gravity.