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9.461 x 1015 Meter

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1 AU?

= 1.496 x 1011 Meter

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Definition "star"?

=Large, glowing ball of gas that generates heat an light thgrough nuclear fusion in its core.

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Definition "planet"?

= moderately large object orbiting a star & shining primarily by reflecting light from its star.

According to IAU: Object is a planet if it:

  1. orbits a star
  2. is large enough for its own gravity to make it round
  3. has cleard most other objects from its orbital path
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Definition "Exoplanets"?

= Planet, that:

  1. Orbits a star or stellar remnant
  2. has a mass lower than the mass required for deuterium burning
  3. fulfils the mass/size creria of planetss in the solar system.
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Definition "Moon / Satelite"?

= Object orbiting a planet / one object orbiting another.

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Definition "asteroid"?

= relatively small and rocky object orbiting a star.

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Definition "Comet"?

= relatively small and ice-rich object orbiting a star.

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Order of the Planets?


  1. Mercury
  2. Venus
  3. Earth
  4. Mars
  5. Jupiter
  6. Saturn
  7. Uranus
  8. Neptune
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What are the names of the two comet reservoirs in out solar system?

  1. Kuiper Belt (35-100 AU)
  2. Oort cloud (30'000-100'000 AU)
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Composition of the planets in relation to their distance to the sun?

  • The closer to the Sun the denser they are and the higher their metal content.
  • H and HE abundances in Giant Planets decrease with distance from the Sun.
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Keplers first Law?

  1. Planets travel in an ellipse with the Sun at one focus
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Keplers second Law?

The Plaent sweeps out equal areas in equal Time

=> The Planet goes faster when nearer the Sun

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Keplers third law?

The aquare of the orbital Period P of any Planet is proportional to the cube of the planet's average distance from the Sun:

a3 = kP2

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Newton Laws?

  1. Every Object in a state of uniform motion tends to remain in that state of motion unless acted upon by an external force.
  2. Relationship between an object's mass m, its acceleration alfa and the force F applied upon it is F=ma
  3. For every action there is an equal and opposite reaction.
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What / Where is the "Snowline"?

= Where temperature reaches 0°C and water ice is formed: at 3-4 AU