lifecycle of a star.

Question 1

what is the first stage?

Answer 1

cloud of gas made mostly of hydrogen pulled together by gravity.

Question 2

what does it form in the second stage?

Answer 2

protostar.

Question 3

what happens in stage 3, what does it make what is equal and why?

Answer 3

fusion.
hydrogen to give helium and energy.
main sequence star- gravity and force due to radiation are equal.

Question 4

after fusion what is possible to happen?

Answer 4

become a red giant where the atoms up to carbon and oxygen.
red super giant- firm iron.

Question 5

what happens after a red giant is produced?

Answer 5

white dwarf.

Question 6

what happens after a white dwarf is produced?

Answer 6

black dwarf.

Question 7

what is made after a red super giant, what does it do and what dies that produce?

Answer 7

supernova.
sends out some material.
shock waves produce larger atoms.

Question 8

what are the 2 possibilities after a supernova?

Answer 8

black hole- light can’t escape.
neutron star.

Question 9

when is helium and small nuclei up to carbon made?

Answer 9

main sequence.

Question 10

what is the half life of uranium?

Answer 10

4500 million years.

Question 11

what is the half life of plutonium 239?

Answer 11

24000 years.

Question 12

what is the age of the solar system?

Answer 12

4.5 billion years ago.

Question 13

what did the early université only contain?

Answer 13

hydrogen.

Question 14

where were the heaviest elements formed?

Answer 14

supernova.

Question 15

what star can be made into supernova?

Answer 15

star much bigger than the sun.

Question 16

describe how the universe was lots of different elements?

Answer 16

fusion takes place within a star.
hydrogen formed into helium.
fusion continued and formed larger elements.
elements heavier than iron were formed in supernova.
elements scattered through a supernova.