the solar system.

Question 1

what force acts between 2 masses?

Answer 1

gravity.

Question 2

how many planets are in our solar system?

Answer 2

8.

Question 3

what is the shape of the orbit of a planet?

Answer 3

elliptical.

Question 4

what are the key differences between outer and inner planets?

Answer 4

inner: rocky.
outer: gas giants.

Question 5

what are the key differences between a planet and a dwarf planet?

Answer 5

dwarf: has created neighbourhood around to orbit.

Question 6

what is a comet?

Answer 6

large objects, made of dust and ice, orbits the sun, usually elliptical orbit.

Question 7

what is the process in the sun (brith of a star?)

Answer 7

gravity pulls them together hydrogen atoms.
speed increases and temperature increases.
initiates nuclear fusion.

Question 8

when the temperature in the process of making a star increases what is it known as?

Answer 8

protostar.

Question 9

how/ what are moons and planets formed from?

Answer 9

debris left over from this process.