Flashcards
Exploring our solar system.
Flashcards do conjunto (23)
- 1What is a meteor made out of?It is made of grains of dust.
- 2Describe the orbit of comets.They pass inside the orbit of mercury and go out well beyond the orbit of pluto.
- 3What happens to a meteor when it enters the Earth's atmosphere?They heat the air around them, making them glow. The streak before them is known as a "shooting star".
- 4What is a comet?A chunk of ice and rock, originating from outside the solar system.
- 5What is a asteroid?Simply a rock in orbit.
- 6Where are black holes formed?They are formed where stars use to be.
- 7Why can you not see a black hole?No light escapes from it.
- 8Describe a black holes' mass and size.It has a very large mass, but tiny size.
- 9How centripetal force act?It act towards the centre of the circular orbit.
- 10What is the source of centripetal force?Gravitational attraction is the source.
- 11Name a 3 advantages of using a unmanned probe.It can go to dangerous places humans can't.
They don't put humans at risk.
They cost much less. - 12Name a disadvantage of taking humans in spacecraft.Large amounts of oxygen, food and water have to be taken.
- 13Name a benefit of astronauts living in pressurised spacecraft.The can wear normal clothing, no special suits.
- 14Why does a space suit have a dark visor?To stop them from being blinded by the sun.
- 15There is no oxygen in space, how does the suit solve this problem?The suit is pressurised and has a oxygen supply for breathing.
- 16The surface of the suit face the sun can become how hot?120C
- 17The suit facing away from the sun can become how cold?-160C
- 18When travelling in space, what happened the to gravitational forces compared to Earth?Space has lower gravitational forces compared to the Earth.
- 19Name a disadvantage of using a unmanned probe.They have to be very reliable, and self sufficient because there is no way of fixing them when they breakdown.
- 20What speed does light travel at?300, 000 km/s
- 21How long does it take for light from the sun to reach the Earth?Eight minutes.
- 22How long does it take for light to get here form the nearest star?4.22 years.
- 23When does America plan to go to mars and how much will it cost?2020, 400 billion pounds.
Informações
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- O usuário eliminou as informações de disciplina FlashCards sobre Exploring our solar system., criado por Usuário eliminado em 04-10-2016.
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- Usuário eliminado · out 2016
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- 12 jan 2017
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- Criado por Ella Maggs · 1 jun 2016
- Copiado por Derek Cumberbatch · 4 out 2016
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