Space Physics

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what are the eight planets that orbit the sun and what order do they go in
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
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what happens when planets get further away from the sun
they take longer to make a full orbit of the sun
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what is a moon
a object which orbits a larger object due to gravity it is a natural satellite
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what are asteroids
are irregularly shaped lumps of rocks that orbit the sun
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what is a dwarf planet
a planet-like object which orbits the sun
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what is a comet
a lump of ice, rock and dust which orbits the sun
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What is the name of the galaxy in which Earth is located
The Milky Way
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how have our ideas about the solar system
the Greeks believe that the universe was geocentric, 1700 the idea of heliocentricstarted to becom accepted
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evidence against an earth-centred universe
1. apparent retrograde motions of Mars 2. Mars varies in brightness 3. Venus has phases 4. Jupiter has four moons
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what is a nebula
is a cloud of gas and dust
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what happens when a star is made
gravity due to mass contained within the nebula causes it to collapse on its self as the nebula collapses its temp increases rapidly. the contracting ball of gas and dust is called a protostar. if the temp is high in the core of the protostar the H+
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what happens when a star is made
nuclei can begin to fuse together to form helium, the energy released from the nuclear fusion allows the star to shine for millions or billions of years
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what equation shows that the sun is balanced
inwards force due to gravity = outward force due to pressure
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what is the sun refereed to as
the main sequence star
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what happens to a start if the temp increases
it epandes
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what does the life cycle of a star depend on
it mass
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What will happen to the Sun immediately after all of the hydrogen in its core has been used up?
It will turn into a red giant It will turn into a supernova
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what is the red shift
the observed increase in the wavelength of light from most distant galaxies we say that light from the distant galaxy has been red-shifted
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what causes red-shift
when a star is moving away from us
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what is hubble's law
the speed at which a galaxy is moving away from us is proportional to is distance from us
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what does the big bang theory say
the universe started from a single point contained all of its mass and energy- unvierse is still expanding - expanding more quickly - due to dark energy - scientists believe in dark matter
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Other cards in this set

Card 2

Front

what happens when planets get further away from the sun

Back

they take longer to make a full orbit of the sun

Card 3

Front

what is a moon

Back

Preview of the front of card 3

Card 4

Front

what are asteroids

Back

Preview of the front of card 4

Card 5

Front

what is a dwarf planet

Back

Preview of the front of card 5
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