GCSE Physics (AQA)

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Comparing Orbits

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Space physics Solar system; stability of orbital motions; satellites

Comparing Orbits

3:56 Stars and the Solar System
Spec 4.8.1.3
Previous Gravitational Orbits Next Birth of a Star
  • The larger the radius of an orbit, the longer a planet or satellite will take to travel around it.
  • Orbits are paths taken by satellites around a planet or by planets around the sun due to gravitational forces.
  • Mercury travels quickly with a shorter path around the sun, completing its orbit in 88 days.
  • Venus travels more slowly with a longer path, taking 225 days to complete its orbit.
  • The further a planet is from the sun, the longer it takes to complete its orbit.
  • Data on orbits can be used to make predictions, such as estimating Saturn's orbital time at 30 years.
  • Astronomers have used orbital data to predict the behavior of undiscovered planets.
  • Satellites typically have smaller orbits than planets, such as the moon orbiting Earth.
  • The moon's orbit around Earth is 384,000 kilometers, over 100 times smaller than Mercury's orbit.
  • Satellites complete orbits in less time due to shorter distances, e.g., the moon takes 27 days to orbit Earth.
  • Understanding the relation between orbital radius and time is important for satellite positioning.
  • Geostationary satellites are positioned to remain over the same point on Earth, requiring a 24-hour orbit.
  • Geostationary satellites need an orbital radius of around 36,000 kilometers.
  • Not all artificial satellites have the same radius; polar satellites have shorter orbits and are closer to Earth.

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