astronomy test 2

Question 1

explain nuclear fusion

Answer 1

where L nuclei (deuterium and tritium) combine to make a heavier atom (helium)

Question 2

what two elements make up a star

Answer 2

hydrogen and helium

Question 3

what is the difference between stars that are plants and stars the are galaxies

Answer 3

planets - shine by reflected light, small, move
galaxies - shine by light they create, very large, stationary

Question 4

what is the explosion called at the end of a stars life

Answer 4

supernova

Question 5

what instrument is used to obtain characteristics about a star

Answer 5

telescope/spectroscope

Question 6

give 2 reason why the sun is important

Answer 6

light, keeps earth in orb it (gravity )
warmth (maintains constant temperature range)

Question 7

what protects the earth from charged particles released from the earth

Answer 7

magnetosphere

Question 8

what part of the sun do these charged particles come from

Answer 8

solar flare

Question 9

what is parsec used to mesure

Answer 9

distance between galaxies

Question 10

what are ly used

Answer 10

distance within galaxies

Question 11

when are AU used

Answer 11

within solar systems

Question 12

what is an AU

Answer 12

AU = 150 000 000 km therefore the sun are earth are One AU apart

Question 13

what is the name given to the study of the nature, origin and evolution of the universe

Answer 13

Big Bang theory

Question 14

how do we know our galaxy is expanding

Answer 14

outer planets are “red shifted”

Question 15

what are the three types of galaxies

Answer 15

elliptical - football shaped, old stars little gases
spiral - pinwheel shaped, young star, lots of gases
irregular - undefined shape, mix of old and new stars, gases

Question 16

the brightness of a star as if it were located 33 ly from Earth

Answer 16

absolute

Question 17

indicates a star’s surface temperature

Answer 17

colour

Question 18

determines the length and magnitude stages of a star’s life cycle

Answer 18

mass

Question 19

the total amount of energy produced by a star

Answer 19

luminosity

Question 20

what does if mean if a star is red shifted

Answer 20

it is moving away

Question 21

what is the difference between a meteor and a comet

Answer 21

meteor - rocket with dust
comet - icy with dust

Question 22

meteor, meteorite and meteoroid

Answer 22

meteor - shooting stars
meteorite - rocky fragments the hit the earth
meteoroid - a small asteroid

Question 23

where is the Kuiper belt found

Answer 23

outside the solar system