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Physics GCSE > Astronomy (11) > Flashcards

Astronomy (11) Flashcards

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1
Q

Our Solar System is in the _________ _______ galaxy

A

Milky way

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2
Q

What is a galaxy

A

A collection of stars

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3
Q

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

A

Stars

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4
Q

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

A

Greater

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5
Q

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

A

Gravity

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6
Q

Like most things in the universe, galaxies ___________

A

Rotate

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7
Q

What is a universe

A

A large collection of billions of galaxies

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8
Q

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

A

Further apart

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9
Q

The universe is mostly ____________ __________ and is really really _____

A

Empty space

Big

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10
Q

Gravity provides the force which causes _____________

A

Orbits

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11
Q

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

A

Force

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12
Q

What is an orbit

A

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

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13
Q

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

A

Circular
Gravity
Sun

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14
Q

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

A 
Moon
Moon
Moon
Moon
Moon
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15
Q

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

A

Orbit

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16
Q

Gravity ____________ quickly as you get further away

A

Decreases

17
Q

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 _____________

A

Stronger
Faster
Quicker

18
Q

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

A

Slower

19
Q

The orbits of moons and planets are usually slightly _____________

A

Elliptical

20
Q

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

A

Elliptical

21
Q

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

A

Longer

22
Q

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

A

Faster

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

23
Q

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

A

Geostationary

24
Q

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

A

Speed = Distance / Time

25
Q

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

A

Circumference

2 x π x radius of orbit

26
Q

What is the formula for the speed of an orbit

A

2 x π x radius of orbit / Time period

27
Q

Symbol formula for the speed of an orbit

A

V = 2 π r / T

Physics GCSE (22 decks)

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