7.16-7.19 Evolution of stars

Question 1

How is a Nebula formed?

Answer 1

Gravity pulls dust and gas together to a form a massive cloud known as nebulae

Question 2

What is the main gas in nebulae?

Answer 2

Hydrogen

Question 3

How is a main sequence star formed?

Answer 3

.The force of gravity holding the star together is balanced at higher pressure due to the high temperatures

Question 4

How is a red giant formed?

Answer 4

When all the hydrogen has been used up in the fusion process large nuclei begin to form and the star may expand to become a red giant

Question 5

Hows a white dwarf star formed?

Answer 5

.When all nuclear reactions are over a small star will being to contract under the force of gravity
.In this instance the star will begin to become a white dwarf which fades and changes colour as it cools

Question 6

How does the balance between thermal expansion and gravity affect a star?

Answer 6

.The outward pressure from the stars outward hot gases is balanced by the force of the stars gravity

Question 7

State the life cycle of a star that is larger than the sun

Answer 7

.Protostar
.Main sequence star
.Red super giant star
.Supernova
.Black hole or neutron star

Question 8

What wavelengths can be used when observing space?

Answer 8

All in the EM spectrum

Question 9

Which three rays cannot be measured in the Earths atmosphere?

Answer 9

.X rays
.Gamma
.UV

Question 10

Why can you not measure X rays, Gamma and UV rays in the Earths atmosphere?

Answer 10

.The atmosphere does not allow these to reach the ground

Question 11

What did early refracting telescopes evolve to?

Answer 11

Reflecting telescopes

Question 12

What did Technological advances allow for?

Answer 12

Other parts of the EM spectrum to be measured and collected