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Description
Flashcards by Ella Maggs, updated more than 1 year ago
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Created by Ella Maggs
almost 8 years ago
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| Question | Answer |
| What is a meteor made out of? | It is made of grains of dust. |
| Describe the orbit of comets. | They pass inside the orbit of mercury and go out well beyond the orbit of pluto. |
| What 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". |
| What is a comet? | A chunk of ice and rock, originating from outside the solar system. |
| What is a asteroid? | Simply a rock in orbit. |
| Where are black holes formed? | They are formed where stars use to be. |
| Why can you not see a black hole? | No light escapes from it. |
| Describe a black holes' mass and size. | It has a very large mass, but tiny size. |
| How centripetal force act? | It act towards the centre of the circular orbit. |
| What is the source of centripetal force? | Gravitational attraction is the source. |
| Name 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. |
| Name a disadvantage of taking humans in spacecraft. | Large amounts of oxygen, food and water have to be taken. |
| Name a benefit of astronauts living in pressurised spacecraft. | The can wear normal clothing, no special suits. |
| Why does a space suit have a dark visor? | To stop them from being blinded by the sun. |
| There is no oxygen in space, how does the suit solve this problem? | The suit is pressurised and has a oxygen supply for breathing. |
| The surface of the suit face the sun can become how hot? | 120C |
| The suit facing away from the sun can become how cold? | -160C |
| When travelling in space, what happened the to gravitational forces compared to Earth? | Space has lower gravitational forces compared to the Earth. |
| Name 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. |
| What speed does light travel at? | 300, 000 km/s |
| How long does it take for light from the sun to reach the Earth? | Eight minutes. |
| How long does it take for light to get here form the nearest star? | 4.22 years. |
| When does America plan to go to mars and how much will it cost? | 2020, 400 billion pounds. |
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