M5- C19 Flashcards
1
Q
Nebulae
A
Gigantic clouds of dust and gas
2
Q
Protostar
A
A very hot and dense sphere of dust and gas
3
Q
Planets
A
- has a mass large enough for its own gravity to give it a round shape
- has no fusion reactions
- has cleared its orbit of most other objects
4
Q
Dwarf planets
A
Like planets but have not cleared its orbit of other objects
5
Q
Asteroids
A
Objects too small and uneven to be planets, usually in near circular orbits round the sun and without the ice present in comets
6
Q
Planetary satellites
A
A body in orbit around a planet
7
Q
Comets
A
Range from a few hundred m to tens of km across
Small irregular bodies made up of ice, dust and small pieces of rock
Orbit the sun in elliptical orbits
8
Q
Solar systems
A
Contains the sun and all objects that orbit it
9
Q
Galaxies
A
A collection of stars and interstellar dust and gas. A galaxy will contain approximately 100 billion stars
