astronomy

Question 1

what is it called where the sun lies in the centre and planets orbit it?

Answer 1

helio-centric

Question 2

what is an example of a natural satellite which orbit planets?

Answer 2

the moon which orbits earth

Question 3

what do dwarf planets orbit?

Answer 3

they obit the sun

Question 4

what are the 8 planets?

Answer 4

My- mercury
Very- venus
Easy- earth
Method- mars
Just- jupiter
Sounds- saturn
Unusually- uranus
Nice- neptune

Question 5

why do some planets have rings?

Answer 5

their gravitational field is so strong, it attracts debris

Question 6

what are smaller planets mainly made of?

Answer 6

rock

Question 7

what are larger planets mainly made of?

Answer 7

gas

Question 8

what is the geocentric model?

Answer 8

the idea that the earth was at the centre and other planets, moons and sun orbited the earth

Question 9

what is red shift?

Answer 9

the lines shift towards the red part of the spectrum which has a higher wavelength

Question 10

what are the two evidences for the Big Bang?

Answer 10

• red shift: shows the universe is expanding so that means it was formed from a single point
• CMB (cosmic microwave background) radiation

Question 11

what is the steady state theory?

Answer 11

as the universe expands, matter is constantly being created so there is a constant density of matter