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Grade 9 Science > Space > Flashcards

Space Flashcards

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1
Q

What is the orbital period of earth

A

365.25

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2
Q

What is rotational period of earth

A

1 day

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3
Q

What is the average temp on earth surface

A

15

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4
Q

What is earths distance from sun

A

1 AU

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5
Q

What is earth mass

A

6x10(24) kg

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6
Q

Earth radius

A

6000km

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7
Q

Earth axis tilt

A

23

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8
Q

How to add or subtract scientific notation

A

Make the exponents the same then add the bottom number

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9
Q

How to multiply and divide scientific notation

A

Multiply bottom number and add exponents. Divide bottom number and subtract exponents

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10
Q

How many km in an AU

A

150000000

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11
Q

What type of radiation is light

A

Electromagnetic

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12
Q

What is the danger level of high wavelength and low wavelength

A

High wavelength is less dangerous than low wavelength

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13
Q

Can animals detect heat

A

Snakes can

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14
Q

How much larger is the sun than earth

A

1 million time smass

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15
Q

Is fusion a chemical reaction

A

No

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16
Q

What happens in sun core

A

Hydrogen fuses to become helium

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17
Q

How long does energy by fusion take to pass through sun

A

Millions of years

18
Q

What does surface of sun look like

A

Boiling liquid

19
Q

What is suns surface called

A

Photosphere

20
Q

What are sunspots

A

Cooler spots on sun. They are between 3400-5500 degrees

21
Q

When was solar system formed

A

4.5 billion years ago from nebula.

22
Q

Which planets are in prograde

A

All but Uranus and Venus

23
Q

Which planets are in retrograde

A

Uranus and Venus

24
Q

Definition of planet

A

Orbits star. Large enough to be spherical. Clears orbital path.

25
Q

When does earth orbit change from circular to elliptical

A

Every 100k years

26
Q

Why do Venus and mercury have no moons

A

Suns gravity pulls it away

27
Q

Why do we have seasons

A

Earths tilt

28
Q

When does moon orbit earth

A

Every 30 days

29
Q

What causes tides

A

Moon and sun gravity. And shape of beach.

30
Q

4 phases of moon

A

New moon (between earth and sun) fill moon (15 days after new moon) and first and second quarter

31
Q

Who discovered universe expanding and how

A

Hubble found galaxies moving away from each other

32
Q

What is Doppler affect

A

Wavelengths change depending on where you receive. Hubble noticed with stars.

33
Q

What is cosmic radiation

A

Thermal radiation in microwave spectrum between stars leftover from big banf

34
Q

What is the centre temp of nebula while star is formed

A

Hydrogen is 15000000m

35
Q

What do hydrogen atoms form

A

Helium

36
Q

What happened when star uses up hyrdoegen

A

Helium core collapses and thin hyrdrogen layer expands. It becomes red giant.

37
Q

Why are stars red giant

A

Red because cooled and giant because expanded.

38
Q

What would happen to redo giants if the star was size of our sun

A

Helium fuse to form carbon and outer hydrogen is released. Become white dwarf.

39
Q

What will happen to 10x our. Sun

A

Star will form heavy elements like iron which will not fuse. The star will then go supernova. While atoms in outer layer fuse.

40
Q

If mass is 1.4-3x our sun

A

It will go supernova and then become a neutron star.

41
Q

If star is more than 3x our sun

A

The star collapses on itself and becomes black hole

42
Q

How do black holes work

A

Take up no space but 100x more massive than sun. Swallows everything near and galaxies orbit them.

Grade 9 Science (4 decks)

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