Planets are non luminous and revolve around the sun in elliptical

  • orbit
  • axis
  • path
  • circle

Phases of appearance of moon are caused by the movement of moon around the

  • sun
  • earth
  • planets
  • stars

Rovers were the

  • robots
  • satellites
  • voyagers
  • space probes

The light of Proxima Centauri reaches the earth in

  • 4 years
  • 4.2 years
  • 2 years
  • 365 days
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