Astronomy (11)

Question 1

Our Solar System is in the _________ _______ galaxy

Answer 1

Milky way

Question 2

What is a galaxy

Answer 2

A collection of stars

Question 3

Our Sun is just one of many billions of ________ which form the Milky Way galaxy

Answer 3

Stars

Question 4

The distance between neighbouring stars in the galaxy is often millions of times __________ than the distance between planets in our solar system

Answer 4

Greater

Question 5

The force which keeps the stars together in a galaxy is called ____________

Answer 5

Gravity

Question 6

Like most things in the universe, galaxies ___________

Answer 6

Rotate

Question 7

What is a universe

Answer 7

A large collection of billions of galaxies

Question 8

Galaxies themselves are often millions of times ____________ ___________ than the stars are within a galaxy

Answer 8

Further apart

Question 9

The universe is mostly ____________ __________ and is really really _____

Answer 9

Empty space

Big

Question 10

Gravity provides the force which causes _____________

Answer 10

Orbits

Question 11

If an object is travelling in a circle it is constantly changing direction, which means there must be a _________ acting on it

Answer 11

Force

Question 12

What is an orbit

Answer 12

A balance between the forward motion of the object and a force pulling it inwards

Question 13

The planets move around the sun in almost ____________ orbits. The forces that make this happen are provided by the _____________ between each planet and the ______

Answer 13

Circular
Gravity
Sun

Question 14

The _________ orbits the earth. Confusingly, other planets also have ‘________’ orbiting them. These __________ have their own names, but we just call the earth’s _______ -‘_______’

Answer 14

Moon
Moon
Moon
Moon
Moon

Question 15

Artificial satellites that are made by man and put into space by rockets also ________ the Earth

Answer 15

Orbit

Question 16

Gravity ____________ quickly as you get further away

Answer 16

Decreases

Question 17

The closer you get to a star or planet, the ____________ the force of attraction. Because of this stronger force, planets nearer the sun move ____________ and cover their orbit _____________

Answer 17

Stronger
Faster
Quicker

Question 18

Moons and artificial satellites are also held in orbit by gravity. The further out from earth they orbit, the ___________ they move

Answer 18

Slower

Question 19

The orbits of moons and planets are usually slightly _____________

Answer 19

Elliptical

Question 20

Comets orbit the sun but have very ____________ orbits with the Sun at one focus (near one end of the orbit)

Answer 20

Elliptical

Question 21

Comets have orbital periods much ___________ than the earth, as they travel from the outer edges of the Solar System

Answer 21

Longer

Question 22

A comet travels much ____________ when it’s nearer the sun than it does in more distant parts of its orbit. Why?

Answer 22

Faster

Because the increased pull of gravity makes it speed up the closer it gets to the sun

Question 23

Some artificial earth satellites have an orbital speed of exactly one day. They’re called __________________ satellites, and are useful in communications because they’re always over the same part of the planet

Answer 23

Geostationary

Question 24

You can calculate the speed of an orbit using which formula?

Answer 24

Speed = Distance / Time

Question 25

For a circular object, the distance travelled is the ________________ of the orbit which is given by the formula

Answer 25

Circumference

2 x π x radius of orbit

Question 26

What is the formula for the speed of an orbit

Answer 26

2 x π x radius of orbit / Time period

Question 27

Symbol formula for the speed of an orbit

Answer 27

V = 2 π r / T