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OCR 21C Science P1 > The Solar System > Flashcards

The Solar System Flashcards

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1
Q

What can our Sun also be called?

A

A star

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2
Q

What is meant by a ‘Solar System’?

A

All of the things that orbit a star (Sun)

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3
Q

What is meant by an orbit?

A

When an object (or planet) moves around another e.g. the Earth orbits the Sun.

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4
Q

The moon orbits the Earth. What does this mean?

A

The moon moves around the Earth

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5
Q

How many planets orbit our Sun?

A

8

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6
Q

List the planets in order of distance from the Sun

A

Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune

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7
Q

What is meant by the inner planets?

A

The planets closest to the Sun

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8
Q

Name the inner planets.

A

Mercury
Venus
Earth
Mars

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9
Q

What is meant by the outer planets?

A

The planets that are much further away form the Sun

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10
Q

Name the outer planets

A

Jupiter
Saturn
Uranus
Neptune

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11
Q

What is found in between the orbits of Mars and Jupiter?

A

The asteroid belt

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12
Q

What else, other than planets, orbit the Sun?

A

Dwarf planets
comets
dust

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13
Q

What do planets often have orbiting them?

A

Moons

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14
Q

How are stars different to planets?

A

They are much bigger
They are very hot
They are far away
They give out their own light

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15
Q

How are planets different to stars?

A

They are smaller
They do not give out light - they reflect light from the Sun
They are closer to us

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16
Q

How old is our Solar System?

A

5 billion years old

17
Q

How was our Sun formed?

A

Dust and gas clouds were squeezed
Gravity continued to squeeze the particles
The cloud collapsed in on itself
a Protostar is formed
The temperature increases
Hydrogen undergoes fusion to form helium
This results in heat a light - a Sun is born

18
Q

What are planets made from?

A

The heavier elements formed from the clouds of dust in our early solar system

19
Q

Where are the oldest rocks on Earth from?

A

They are meteorites from space

20
Q

How do we know that the solar system is at least 4.5 billion years old?

A

Because the oldest rocks on Earth are that age

21
Q

Asteroids and comets formed from

A

stuff left over from the formation of the solar system

22
Q

What is an asteroid?

A

smallish lumps of rubble and rock that did not form planets

23
Q

What is a comet?

A

A ball of rock, dust and ice which orbits the Sun in a very elongated elilipse.

24
Q

Why do comets sometimes have tails>

A

When a comet comes near the Sun, its ice melts, leaving a bright tail of gas and debris which we can see from Earth

25
Q

The planets orbit in an ellipse shape. What do we mean by this?

A

An ellipse shape is an almost circular path (like a squashed circle)

OCR 21C Science P1 (3 decks)

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