structure of the universe

• What is the term for anything that orbits a planet?

  Satellite
• What distinguishes natural satellites from artificial satellites?

  Natural satellites are not man-made, while artificial satellites are man-made
• What is an example of a natural satellite?

  The Moon
• What are some uses of artificial satellites?

  They are used for communication and orbiting telescopes
• How many planets orbit the Sun in our solar system?

  Eight
• What is the central star of our solar system called?

  The Sun
• Name three planets in our solar system.

  Earth, Mars, Jupiter
• What type of orbit do planets follow around the Sun?

  Slightly elliptical orbit
• What are the two structures mentioned that are found in the solar system?

  Asteroids and comets
• What are asteroids primarily made of?

  Rock and metal
• Where are most asteroids found?

  Mainly in the asteroid belt between Mars and Jupiter
• What are comets primarily composed of?

  Ice and dust
• How do the orbits of comets differ from 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?

  Massive collections of billions of stars
• How does our solar system relate to the Milky Way Galaxy?

  Our solar system is a tiny speck in the Milky Way Galaxy
• What force holds stars together in a galaxy?

  Gravity
• How do stars in a galaxy move?

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

  Mostly empty space scattered with galaxies
• What is the relationship between galaxies and stars?

  Galaxies are collections of billions of stars
• What is a solar system composed of?

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

  Satellites
• What are the main components of the solar system?

  • Central star (the Sun)
  • Eight planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune)
  • Natural satellites (e.g., the Moon)
  • Artificial satellites
  • Asteroids (mainly in the asteroid belt)
  • Comets (made of ice and dust)
• What is the structure of the universe and its components?

  • The universe is mostly empty space
  • Scattered with galaxies
  • Galaxies contain billions of stars
  • Many stars have their own solar systems
  • Solar systems consist of a central star and orbiting planets
  • Planets can have satellites