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Science > Space > Flashcards

Space Flashcards

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Biology 101 flashcards
1
Q

What is a planet?

A

A spherical object that orbits a star.

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2
Q

What is a star?

A

A very large sphere of burning gas in space.

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3
Q

State the name of the star the earth travels around.

A

The sun

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4
Q

What word is used to describe the path an object takes around another object in space?

A

Orbit

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5
Q

What name is given to the planets and other objects that orbit the sun?

A

The solar system.

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6
Q

What shape do most planetary orbits have>

A

Elliptical.

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7
Q

Name the planets in our solar system in order of distance from the sun.

A

Mercury, Venus, earth, mars, Jupiter, Saturn, Uranus, Neptune.

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8
Q

What is an asteroid?

A

A small rocky object orbiting the sun.

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9
Q

What is a comet?

A

An object made of rock, ice and dust orbiting the sun.

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10
Q

What is a galaxy?

A

A group of billions of stars.

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11
Q

What is the universe?

A

All objects in space together.

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12
Q

What is a vacuum>

A

An area which has no particles.

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13
Q

What is a light year?

A

The distance travelled by light in a year.

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14
Q

How is a protostar formed?

A

The force of gravity pulls the dust and gas together.

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15
Q

What word is used to describe the amount of material in an object.

A

Mass

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16
Q

What is the unit and unit symbol for mass.

A

kilograms, kg.

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17
Q

What is a field?

A

The area around an object where a non-contact force acts.

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18
Q

What kind of field causes weight?

A

Gravitational field.

19
Q

How does mass change in the universe?

A

It does no change; it remains the same.

20
Q

How does weight change in the universe?

A

It depend on the gravitational field strength of a location.

21
Q

What type of force is gravity?

A

Non-contact force.

22
Q

Which two factors affect the weight of an object?

A

Mass and gravitational field strength.

23
Q

What is gravitational field strength?

A

How strong a gravitational field is.

24
Q

What is the gravitational field strength on Earth?

A

9.8N/kg.

25
Q

What is the unit and unit symbol for gravitational field strength?

A

Newtons per kilogram(N/kg)

26
Q

What is the symbol for weight?

A

W

27
Q

What is the unit and unit symbol for weight?

A

Newtons,N.

28
Q

What is the equation that relates to weight, mass and gravitational field strength?

A

W= m x g

29
Q

In what direction does gravity act?

A

Towards the centre of objects.

30
Q

What is a satellite?

A

An object that orbits a larger object in space.

31
Q

How long is a year on Earth in days.

A

365.25 days.

32
Q

What is the name of the imaginary line that goes vertically through the Earth?

A

Earth’s Axis.

33
Q

What is the name for the imaginary line that goes horizontally through the middle of the Earth?

A

The equator.

34
Q

What causes day and night?

A

The earth spinning on it’s axis.

35
Q

How long is a day on Earth in hours?

A

24 hours.

36
Q

What does the equator separate the world into?

A

North and South hemisphere.

37
Q

How far is the Earth axis tilted by?

A

23.4 degrees.

38
Q

What causes seasons?

A

Earth’s tilted axis and it’s orbit around the sun.

39
Q

Give three factors that are affected by seasons.

A

Average temperature, length of day, height of the sun in the sky.

40
Q

Explain how the titled axis affects light from the sun?

A

The more tilted the surfaced, the greater the area light must spread out over.

41
Q

If the North pole is tilted towards the Sun, what season will it be in the Northern hemisphere?

A

Summer.

42
Q

If the North pole is tilted towards the Sun, what season will it be in the southern hemisphere?

A

Winter.

43
Q

Why is it hotter in the hemisphere which is pointed to the sun?

A

The sunlight is concentrated.

Science (4 decks)

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