Topic One: Our Solar System Flashcards Preview

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Flashcards in Topic One: Our Solar System Deck (61)
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1
Q

What are the Poles?

A

the points that the axis of rotation of the Earth passes through

2
Q

What is the Equator?

A

a circle around the middle of the Earth at equal distances from each pole.

3
Q

What is a Zenith?

A

the point directly above you in the sky

4
Q

Who first measured the Earth’s circumference accurately?

A

Eratosthenes

5
Q

What shape is the Earth?

A

An Oblate Spheroid

6
Q

How long is a sidereal day?

A

23 hours and 56 minutes

7
Q

What is a sidereal day?

A

How long the Earth takes to rotate on its axis.

8
Q

What is the Horizon?

A

an imaginary line where the land meets the sky

9
Q

What is latitude?

A

the angle of a location North or South of the equator

10
Q

What is the Meridian?

A

an imaginary circle that passes through both poles. The prime meridian goes through Greenwich

11
Q

What is Longitude?

A

the angle of a location East or West of the prime meridian

12
Q

Why is the sky blue?

A

The sky is blue because blue light from the Sun is scattered more than bigger wavelengths so appears to come from all directions

13
Q

What is the atmosphere made up of?

A

Nitrogen, Oxygen, Carbon Dioxide, Argon and Water Vapour.

14
Q

What waves can pass through the atmosphere?

A

Visible light, microwaves and some radio waves.

15
Q

What rays are absorbed the atmosphere?

A

Infra red, ultra violet and x-rays

16
Q

What is the difference between a refracting telescope and a reflecting telescope?

A

A refracting telescope uses lenses to produce a magnified image yet a reflecting telescope uses a large mirror.

17
Q

What is the moon’s diameter?

A

3,500km

18
Q

How far is the moon from the Earth?

A

380,000km

19
Q

How long is the moon’s rotational period?

A

27.3 days

20
Q

How long is the moon’s orbital period?

A

27.3 days

21
Q

Why does the moon have virtually no atmosphere?

A

Not enough gravity to keep one.

22
Q

Why do we only see one side of the moon?

A

Because the moon’s orbital and rotational periods are the same in length

23
Q

http://b2l2.com/wp-content/uploads/2011/12/sea-of-tranquility.jpg

What part of the moon is this?

A

Sea of Tranquillity

24
Q

http://www.lunarregistry.com/moonshots/storms_th.jpg

What part of the moon is this?

A

Ocean of Storms

25
Q

http://3.bp.blogspot.com/_YoCIFkM3GQ8/TDIXG_oz7mI/AAAAAAAAIpg/Fs0zuNS6weQ/s400/VMA-Crisium-150.jpg

What part of the moon is this?

A

Sea of crises

26
Q

What are these?

https://nightinfocus.files.wordpress.com/2012/01/120107_3craters.jpg

A

The moon’s craters.

27
Q

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

What part of the moon is this?

A

Apennine Mountains

28
Q

What are mare?

A

Lunar Seas. Molten rock due to giant impacts cools to form smooth darker regions

29
Q

What are results on impacts on the moon?

A

Craters. The edges of large Craters form highlands.

30
Q

What are Rilles?

A

Grooves formed by collapsed lava tunnels

31
Q

What are Wrinkle ridges?

A

Low sinuous ridges formed as the crust cooled.

32
Q

What is the Sun’s diameter?

A

1.4 million km

33
Q

What is an AU?

A

The Sun’s average distance from the Earth, 150 million km

34
Q

Name the three outer layers of the sun

A

Photosphere, Chromosphere and Corona

35
Q

What is the Photosphere?

A

Visible surface, 5800K

36
Q

What is the Chromosphere?

A

An outer layer of the sun. Gases in this absorb certain wavelengths so we get dark lines in the solar spectrum

37
Q

What is the Corona?

A

The Crown. Faint and not dense but very hot, about 2 million K

38
Q

What are sunspots?

A

These are patches on the surface of the Sun which appear dark. They are slightly cooler than the surface. Loops in the Sun’s magnetic field leave and enter here.

39
Q

How do we determine the period of rotation of the sun?

A

By observing sunspots

40
Q

What is the Sun’s rotation period at the Equator?

A

25 days

41
Q

What is the Sun’s rotation period at the poles?

A

35 days

42
Q

What is Nuclear fusion?

A

Two nuclei fusing together to form another nuclei. E.g. two hydrogen nuclei fusing together to form a Helium nuclei.
Nuclear fusion releases large amounts of energy

43
Q

What are the charged particles the sun emits called?

A

Solar Wind

44
Q

How long is the Lunar phase cycle?

A

29.9 days

45
Q

How much smaller is the Moon’s diameter than the Sun’s?

A

400x

46
Q

Why do the Sun and Moon appear to be the same size in the sky?

A

The Moon’s diameter is 400x smaller than the Sun but the Sun is also 400x further away from the Earth as the moon.

47
Q

What is a Solar Eclipse?

A

When the Moon comes between the Earth and the Sun.

48
Q

Why is a total solar eclipse rare?

A

These are rare because the orbit of the Moon is slightly tilted.

49
Q

How long does totality last in the total solar eclipse?

A

Totality lasts for around a minute. In this time the Sun’s corona is visible.

50
Q

What’s a Lunar Eclipse?

A

When the Earth comes between the Moon and the Sun.

51
Q

Why does the Moon appear red during a lunar eclipse?

A

The Moon appears red as the light falling on it has passed through the Earth’s atmosphere so all the blue has been scattered.

52
Q

How long do Lunar Eclipses last and why?

A

They last for several hours as the shadow of the Earth is big

53
Q

Where does the sun rise and set?

A

The Sun rises in the East and sets in the West

54
Q

What’s a solstice?

A

When the sun is directly above one of the tropics.

55
Q

What’s an equinox?

A

When the sun is directly above the equator.

56
Q

What is Local noon?

A

this is the time at which the Sun culminates (is highest) in the sky
The shadow made by a vertical stick would be shortest at this time

57
Q

What is a Solar Day?

A

The time between one local noon and the next

The solar day varies throughout the year due to the tilt of the Earth and because its orbit isn’t circular

58
Q

What is the Apparent sun?

A

the Sun as we see it in the sky

59
Q

What is the Mean Sun?

A

an imaginary Sun that culminates exactly every 24 hours

60
Q

What’s Greenwich Mean Time?

A

the mean Sun culminates at exactly 12:00 every day using this time

61
Q

What is the Equation of Time?

A

The difference between GMT and the actual solar time on any day is called the Equation of Time.