Space

Question 1

Why do we have seasons

Answer 1

Because earth is on a tilt, when the earths axis point is pointed towards the sun it is warmer (summer) ad when it is pointed away from the sun it is colder (winter)

Question 2

What is the cause of a full moon

Answer 2

When the earth in in between the moon and the sun

Question 3

Why dosent the arctic circle get sunlight some days of the year

Answer 3

Because the northern hemisphere is tilted away from the sun so sunlight doesn’t reach the arctic circle

Question 4

How does a lunar eclipse occur

Answer 4

Earth comes between the sun and the moon, blocking the sunlight falling on the moon

Question 5

How does a solar eclipse occur

Answer 5

The moon is between the sun and the earth blocking the suns light from reaching us causing a shadow to cast onto earth

Question 6

If you were on the moon during a total lunar eclipse what would you see

Answer 6

You would see a solar eclipse, it is always opposite

Question 7

What Keeps the moon orbiting the earth

Answer 7

Gravity attracts the moon to the earth but because the moon is constantly moving it doesn’t fall down

Question 8

What causes tides on earth

Answer 8

The moon is pulling on us we pul back on the moon causing the water to bulge up and cause high and low tides

Question 9

How long does it take for earth to make a full rotation

Answer 9

24 hours

Question 10

What is gravity

Answer 10

All objects with mass are attracted to other things with mass

Question 11

What has gravity done

Answer 11

Formed planets, made planets round, keeps planets in orbit around the sun, gave the solar system its shape, creates stars, keeps some planets warm

Question 12

Why is earths atmosphere special

Answer 12

Keeps us warm by heat being by air particles and heating up the atmosphere, protects us from cosmic rays, protects us from meteors by burning them up before they hit earth

Question 13

What is the Big Bang theory

Answer 13

1. There was a hot ball of matter tinier than an atom
2. Big Bang occurred energy spread outward vey quickly
3. The universe cooled, energy began to turn into matter
4. Over millions of years the matter formed into clumps leading to stars and galaxies

Question 14

Why does the earth have a molten core

Answer 14

Friction from the molten core spinning inside creates friction (heat) the keeps the core warm

Question 15

Why is earths rotation special

Answer 15

Moving molten metals inside creates magnetic fields around us, fiction causes the earth to slow down, determines length of daylight

Question 16

How was our solar system created

Answer 16

• cloud of dust forms from the Big Bang
• gravity pulls dust
  particles together
  -as dust collided core
  heats up
  -nuclear fusion occurs hydrogen collide to form helium
  -solar wind pushes lighter particles outwards and the dense particles stay closer to the sun

Question 17

Why are the terrestrial planets formed near the sun and the gas planets formed farther from the sun.

Answer 17

During the solar nebula the lighter gases were pushed into the outer wheel where the temperatures are lower and the didnt receive enough heat or energy to form a solid surface where as the terrestrial planets on the inner shell are closer to the sun so they formed solid, dense rocky surfaces.

Question 18

What ways do stars change their physical properties

Answer 18

Because of nuclear fusion there will be changes in their temperature, luminosity, size and colour

Question 19

What determines wether a star will become a black hole at the end of its life cycle.

Answer 19

The size of the star. The star must be a massive star in order to possibly end up as a black hole

Question 20

Will the sun form a black hole

Answer 20

No it will not because the sun isn’t a massive star and it follows a different star lifecycle

Question 21

Where do main sequence stars on the H R diagram get their energy from

Answer 21

Their energy source is nuclear fusion. The Rate they do this at depends on the mass of the star.

Question 22

How do stars form

Answer 22

They began in a nebula, gravity pulls particles together over million of years, a protostar forms, gravity pulls in so much matter that core temperature reaches 15 mill degrees celsius, nuclear fusion begins

Question 23

What is nuclear fusion

Answer 23

In the core of a star, hydrogen atoms fuse to form helium atoms and release large amounts of energy

Question 24

2 important things about main sequence stars

Answer 24

1. The higher the temperature and more luminous, the more massive the star is
2. The lower the temperature and less luminous, the less massive the star is

Question 25

What are the 2 lifecycles of stars

Answer 25

1. Protostar,sun-like star (main sequence), red giant, planetary nebula, white dwarf
2. Protostar, massive star, red supergiant, supernova, neutron star OR black hole