# Space

What is weight?
A force
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What is weight measured in?
Newtons
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How many Newtons are in a Kilogram?
Ten
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Why do people refer to astronauts being in 'zero gravity'?
Because people are literally in zero gravity when they are in space
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Why is this the term 'zero gravity' not correct?
Because there is gravity still around in space
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Why do astronauts feel weightless when they are in orbit?
Because the ground isn't pushing up on them
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How are astronauts trained to cope with weightlessness?
The Vomit Comet
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Why don't people in Australia feel like they are upside down?
Because gravity is pulled into the centre of the Earth, not the bottom
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Is the strength of gravity on the Moon more or less than that of Earth? Why?
It is less because the moon has a smaller mass than the Earth.
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Would your weight on the Moon be more or less than it would be on Earth?
More
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If you stood on top of Mount Everest, would your weight be more or less than that of Earth? Why?
It would be more because you are further from the centre of the Earth
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Does gravity get weaker or stronger when there is a bigger distance between two objects?
Stronger
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What happens when you are in the Vomit Comet?
The aeroplane flies up and down and when they are about 30,000 feet up, they feel 'weightless'
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What is the use of a radio dish on a probe?
To send information back to Earth
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What is the use of a computer on a probe?
To control all the instruments
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What is the use of cameras on a probe?
To take photos of space or the planet they are looking at
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What is the use of scientific instruments on a probe?
To gather information about the planet they are observing
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What is the use of nuclear power supplies on a probe?
To provide electricity to run the instruments and radio
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What is the use of the main engine on a probe?
To push the probe into the correct orbit or allow it to change it's orbit
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What is the use of a space engine on a probe?
Just in case the main engine fails
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What is the use of the thrusters on a probe?
To change the angle of the probe, so the cameras or the radio dish can be made to point in the correct direction
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Describe a way in which scientists can find out about the Solar System
Telescopes/Satellites/Space Probes
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What is the use of a heat shield on a probe?
To protect it heating up when it comes back to Earth, from the pressure change
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What is the use of a parachute on a probe?
To slow it down
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What is a lander?
A probe which lands on the surface - analyser
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What is an orbiter?
A probe that orbits around things in space - analyser, takes photos
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What is a rover?
A probe that goes on the surface of a planet/etc... that travels around - analyser
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What is a flyby?
A probe that travels to a planet/etc... observes it, sends it's information to Earth, and then just carries on into space - never comes back
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What is a space telescope?
A telescope in space
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What is a land based telescope?
A telescope on land
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Why are space telescopes better than land based telescopes?
Because the atmosphere is not in the way of it
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What is the use of a solar panel on a probe?
To get heat from the sun and transfer the heat to energy to work
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What was Aristotle's theory about the Sun and planets?
That the planets moved around the Earth in crystal spheres
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What was Nicolaus Copernicus' theory about the Sun and planets?
That the planets were moving in circles around the Sun
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What was Johannes Kepler's theory about the Sun and planets?
That the planets were moving in elliptical orbits around the Sun
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What did Isaac Newton do?
He worked out how gravity kept the planets in their elliptical orbits
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What was Claudius Ptolemy's theory?
He believed that the Earth was the centre of the Solar System and that all of the other planets and the Sun, orbited it
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## Other cards in this set

### Card 2

#### Front

What is weight measured in?

Newtons

### Card 3

#### Front

How many Newtons are in a Kilogram?

### Card 4

#### Front

Why do people refer to astronauts being in 'zero gravity'?

### Card 5

#### Front

Why is this the term 'zero gravity' not correct?