Astronomy
Full Moon
Can only be seen at night
Iron
Strongest bound nucleus.
Meteorites
Burn in atmosphere.
Can only be seen at night
Strongest bound nucleus.
Burn in atmosphere.
Planets outside our Solar System.
All stars and planets have orbits
Came from comets in outer space.
When the sun first shone.
Shields from cosmic radiations
Moon reflects sunlight.
Days getting longer.
Planet orbiting multiple stars.
Coronal mass ejections.
Luminosity varies with stage.
Distance in light-years.
Around a barycenter.
A planet inside our solar system.
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