P16 Flashcards
1
Q
solar system
A
formed from gas and dust clouds that gradually become more and more concentrates, because of gravitational attraction
2
Q
protostar
A
concentrated gas and dust that becomes hot enough to cause nuclear fusion
3
Q
energy inside stars
A
released because of hydrogen nuclei fusing together to form helium nuclei
4
Q
suns stability
A
stable because gravitational forces acting inwards balance the nuclear fusion energy in core acting outwards
5
Q
uranium
A
- heaviest known element
- half-life of 4500 million years
6
Q
unstable stars
A
become unstable when they have no more hydrogen nuclei that they can fuse together
7
Q
stars with about the same mass as the sun
A
- protostar
- main-sequence star
- red giant
- white dwarf
- black dwarf
8
Q
stars much more massive than the sun
A
- protostar
- main-sequence star
- red supergiant
- supernova
- neutron star ( or black hole if enough mass )
9
Q
supernova
A
the explosion of a red supergiant after it collapses
10
Q
black dwarfs
A
the sun fades out, goes cold and becomes a black dwarf.
