(P2) Exploring our solar system

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  • Created by: Anjelala
  • Created on: 20-05-13 01:48
What sort of orbits do Comets have?
Comets have elliptical orbits.
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Explain the comets' elliptical orbits...
> Comets pass inside the orbit of mercury and go out well past the orbit of Pluto.
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What is a meteor made from?
A meteor is made from grains of dust that burn up as they pass through earth's atmosphere.
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Where are black holes formed?
> Black holes are formed where large stars used to be.
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Say 2 properties of a black hole...
>You can't see it because light cant espace through it >It has large mass but still very small size
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What do moons orbit ?
Moons orbit planets .
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What do planets orbit?
Planets orbit stars.
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Why do planets orbit stars?
> Because centripetal force acts on them
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What is the source of the centripetal force?
Gravitational pull.
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Explain further - 'moons orbit planets and planets orbit stars because centripetal force acts on them'...
>Centripetal force acts towards the center of the circular orbit > Gravitational attraction is the source of the centripetal force.
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What are the advantages of unmanned probes?
> Can go where conditions are deadly for humans >Cost less and don't put astronauts lives at risk.
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What are the disadvantages of unmanned space probes?
>They have to be very reliable because there is normally no way of repairing them when they break down.
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What are some disadvantages of Spacecraft carring humans?
> Need large amounts of foods >Water and oxygen aboard.>Astronouts subjected to lower gravitational forces than on earth. >
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Why do astronauts need to wear special spacesuits outside the spacecraft?
>Dark visor stops the person being blinded >Suit is pressurized and has an oxygen supply for breathing >Surface of the suit facing the sun can reach 120 degrees/ Surface of suit facing away from sun may be as cold as -160 degrees.
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What is a light year?
A light year is the distance light travels in a year.
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How long does it take light from the sun to reach Earth?
> Eight minutes
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How does it take take light from the 2nd nearest star to reach us?
>4.22 years
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What is the name of the 2nd nearest star to us?
Proxima Centauri.
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How fast does light travel?
Light travels at 300 000 km/s
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What mission has America planned for after 2020?
> A manned mission to Mars at a cost of £400 billion.
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Other cards in this set

Card 2

Front

Explain the comets' elliptical orbits...

Back

> Comets pass inside the orbit of mercury and go out well past the orbit of Pluto.

Card 3

Front

What is a meteor made from?

Back

Preview of the front of card 3

Card 4

Front

Where are black holes formed?

Back

Preview of the front of card 4

Card 5

Front

Say 2 properties of a black hole...

Back

Preview of the front of card 5
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