Stars

Question 1

Planet definition

Answer 1

dwarf an object in orbit around a star with
- mass large enough for its own gravity to give it a round shape
- no fusion reactions
- has cleared its orbit of other objects

Question 2

dwarf planets

Answer 2

have not cleared their orbit of other objects

Question 3

asteroids

Answer 3

objects too small to be planets, usually in near-circular orbits around the sun and without ice present in comets

Question 4

planetary satellites

Answer 4

a body in orbit around a planet

Question 5

comets

Answer 5

small irregular bodies made of ice and dust + small pieces of rock. all comets orbit the sun.

Question 6

galaxies

Answer 6

collection of stars and interstellar dust and gas.

Question 7

when do stars begin main sequence

Answer 7

when they are low on hydrogen

Question 8

what stars evolve into red giants

Answer 8

between 5 o - 10 o ( solar mass)

Question 9

pauli exclusion principle

Answer 9

2 electrons can’t exist in the same state

Question 10

electron degeneracy pressure

Answer 10

pressure created when core of star begins to collapse under gravity and electrons are squeezed together creating pressure which prevents core from further collapse.

Question 11

Chandrasekhar limit

Answer 11

max mass of a stable white dwarf . electron degeneracy only sufficient to prevent collapse if core has mass less than 1.44 Mo