Astronomy - Universe, Galaxies, Solar systems etc

• What is a satellite?

  Anything that orbits a planet
• What are the two types of satellites?

  Natural and artificial satellites
• What is an example of a natural satellite?

  The moon
• What are artificial satellites used for?

  Communication and orbiting telescopes
• How many planets orbit the sun?

  Eight planets
• Name the planets in our solar system.

  Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
• What type of orbit do planets have around the sun?

  Slightly elliptical orbit
• How do asteroids and comets differ in composition?

  Asteroids are mostly rock and metal
• Where are asteroids mainly found?

  In the asteroid belt
• What are comets primarily made of?

  Ice and dust
• How do the orbits of comets compare to those of planets?

  Comets have much more elliptical orbits
• What is the name of our galaxy?

  The Milky Way galaxy
• What do galaxies consist of?

  Billions of stars
• How does our solar system relate to the Milky Way galaxy?

  It is a tiny speck in the galaxy
• What holds stars together in a galaxy?

  Gravity
• How do galaxies move in relation to their center?

  They spin around the middle
• What is the universe primarily composed of?

  Mostly empty space
• How are galaxies distributed in the universe?

  Scattered throughout mostly empty space
• What is a solar system composed of?

  A central star orbited by planets
• What can orbit planets like Earth?

  Satellites like the moon
• What are the key structures in our solar system?

  • Planets: Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune
  • Satellites: Natural (e.g., moon) and artificial
  • Asteroids: Mostly rock and metal, found in the asteroid belt
  • Comets: Mostly ice and dust, with elliptical orbits
• What is the structure of the universe?

  • Composed of galaxies
  • Galaxies contain billions of stars
  • Stars may have their own solar systems
  • Mostly empty space between galaxies
• What is the relationship between gravity and galaxies?

  • Gravity holds stars together
  • Stars spin around the galaxy's center
• How does the solar system fit into the Milky Way galaxy?

  • Our solar system is a tiny speck
  • Located halfway along one of the Milky Way's spiral arms