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39 Cards in this Set
- Front
- Back
- 3rd side (hint)
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As you _______ the moon you would start to experience the moons gravity. |
approach |
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What is the electromagnetic spectrum? |
light at different wave lengths- (long wave lengths) low energy= infa red (short wave lengths) high energy= ultra violet |
light waves |
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What is a focal point? |
The point at when the light passes through a Convex lens an light beams meet together. |
convex lens |
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What 3 important results are implied by the observation of an expanding universe? |
Gives us information of the Big Bang Theory. Show us the universe is 13.8 billion years old and that there is not centre. |
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The image in a mirror is _________ ________. |
laterally inverted |
back to front |
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Name 4 ways to detect Exoplanets. |
Transit Observations Radial Velocity (star wobble) Direct imaging Gravitational Microlensing |
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Who first showed that the universe was expanding? |
Edwin Hubble |
Initials= EH |
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The closer to space you get the ____ gravity there is. |
less |
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What one way can the light from a star vary? |
If part of it is blocked |
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Which 3 famous scientists based some of their key work on the sun centred universe? |
Galileo, Newton and Iselper |
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True or False? The gravitational field strength due to the earth decreases. There is now less gravitational force to accelerate. |
True :-) |
This is a scenario not a real life event. |
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Why would galaxies in the Local Group not be moving away from us? |
Gravity will pull them together |
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Stars are very large and have huge _____________ ______, this is what holds the planets in orbit. |
gravitational fields |
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Planet also have _______ _____________ fields so they pull stars towards them slightly. |
smaller gravitational |
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Any object will be _________ __ _______. |
attracted to another |
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How can the sun centred explain the apparent backwards movement of planets? |
overtaking |
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Why are exoplanets hard to detect? |
they do not emit their own light, they reflect light from stars. |
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Smooth surfaces reflect ____ regularly than rougher surfaces. |
more |
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A _________ will reflect light and let you see around corners. |
periscope |
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An apple hanging on a branch has a matter (because it is made of matter) and due to the force and this force is called ______. |
weight |
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True or false? As you get further away from planet Earth the influence gets larger. |
false |
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Which type of star was used to measure distances to other galaxies? |
Cepheid variables |
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How did the universe start and when? |
The Big Bang 13.8 billion years ago |
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Sun, Mercury, _____, Earth, Mars, Jupiter, Saturn, Uranus and Neptune |
Venus |
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The angle of incidence __ the angle of reflection. |
equals |
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Which observations made the Earth centred model seem unlikely? |
the movement of the planets |
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What is the big lens at the front of the telescope called? |
objective lens |
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True or false? The mass of the rocket decreases as the fuel is burnt and fuel tanks are discarded. |
True |
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The ______ ______ has been vital in helping astronomers find exoplanets. |
Keplar planet |
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What is another name for an Earth-like planet? |
earth analog |
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What cant you see from a line spectrum? |
all the colours in a rainbow |
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What can cause the star to spin slightly off centre and make it seem like the star is wobbling? |
the gravitational field |
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Who first proposed the idea of a sun centred universe? a) Sir Isaac Newton b) Nicolaus Coperniaus c) Gallileo Gallili d) Iselper |
B- Nicolaus Coperniaus |
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Why is the fact that the universe is speeding up unexpected and hard to explain? |
we believe that gravity pulls things together causing the expansion to slow down, not speed up. |
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On the surface of Earth a 1 kilogram will experience a downward gravitational force of __ _______. |
10 newtons |
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True or false? The image in a mirror is the same size and colour as the object. |
true |
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Why was the Catholic Church especially keen on the Earth centred universe? |
because they believed that God put human in the centre of the universe |
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True or false? The moon has more gravity than Earth. |
false |
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What is an exoplanet? |
a planet outwith our solar system |
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