Earth And Space Flashcards
1
Q
Galaxies
A
a system of millions or billions of stars, together with gas and dust, held together by gravitational attraction
2
Q
Solar system
A
the collection of eight planets and their moons in orbit round the sun, together with smaller bodies in the form of asteroids, meteoroids, and comets.
3
Q
Astronomer
A
an expert in or student of astronomy.
4
Q
Expanding
A
undergo a continuous change
5
Q
Singularity
A
a point at which a function takes an infinite value, especially in space–time when matter is infinitely dense, such as at the centre of a black hole.
6
Q
Cosmology
A
The study of the formation of the universe
7
Q
Star
A
A celestial body that generates its own light and heat.
8
Q
Celestial body
A
Any naturally made object outside the world’s atmosphere
