Astrophysics New

Question 1

universe

Answer 1

a large collection of billions of galazies

Question 2

galaxy

Answer 2

a large collection of billions of stars

Question 3

planetary system

Answer 3

planets and other astronomical objects orbit around a star at the centre

Question 4

name of the galaxy Earth is in

Answer 4

Milky Way Galaxy

Question 5

weight definition

Answer 5

the force acting on an object due to gravitational attraction

Question 6

correlation between mass of a planet and its gravitational field strength

Answer 6

the greater its mas the greater its gravitational field strength

Question 7

what does a higher gravitational field strength mean in terms of forces

Answer 7

large attractive force towards the centre of that planet or moon

Question 8

gravitational field strength of earth

Answer 8

10N/kg

Question 9

g of moon

Answer 9

1.7N/kg

Question 10

g of jupiter

Answer 10

24.7N/kg

Question 11

g of sun

Answer 11

293N/kg

Question 12

g of saturn

Answer 12

10.5N/kg

Question 13

g of uranus

Answer 13

9N/kg

Question 14

g of mars

Answer 14

3.7N/kg

Question 15

what body does a planet orbit

Answer 15

the sun

Question 16

what body does a moon orbit

Answer 16

a planet

Question 17

what body does a comet orbit

Answer 17

the sun

Question 18

what body does an asteroid orbit

Answer 18

the sun

Question 19

what body is the sun

Answer 19

star

Question 19

what bodies do artificial satellites orbit

Answer 19

the Earth

Question 20

what is the rule for a body orbiting another body

Answer 20

the small body must orbit around larger bodies

Question 21

what is orbital motion a result of

Answer 21

gravitational force of attraction acting between two bodies

Question 22

where does the gravitational force of a body act

Answer 22

towards the centre

Question 23

similarities in the way planets orbit the sun

Answer 23

-orbits are all slightly elliptical
all orbit in the same plane
-all travel in the same direction around the sun

Question 24

differences in the way planets orbit the sun

Answer 24

-orbit at different distances from the sun(orbital radius) -they orbit at different speeds -they all take different amounts of time to orbit the sun

Question 25

how does the distance of the moon from the planet affect the time taken to complete each orbit and the speed of the orbit

Answer 25

-closer distance = shorter time, greater speed

Question 26

orbit shape of a comet

Answer 26

-highly elliptical

Question 27

how does the orbit speed of a comet vary

Answer 27

-varies greatly as distance from sun changes -closer to the sun = increasing speed and vice versa

Question 28

how does the direction and plane of a comet's orbit differ from a planet's orbit

Answer 28

direction and plane can be different

Question 29

average orbital speed equation

Answer 29

v = 2πr/T T = orbital period

Question 30

orbital period

Answer 30

time taken for an object to complete one orbit

Question 31

stellar evolution and cosmology not done

Answer 31

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