Astronomy
Stars
Looking back in time.
Red Giant
Sun will swallow Earth.
Venus
A planet inside our solar system.
Axial Tilt
Invisible bow.
Tidal Locking
Same side always faces star.
Full Moon
Can only be seen at night.
Meteorites
Burn in atmosphere.
Planets
Can scatter.
Exoplanets
Planets outside our solar system.
Planetary Orbits
All stars and planets have orbits.
Magnetosphere
Shields from cosmic radiation.
Moonlight
Moon reflects sunlight.
Day
Day getting longer.
Solar Flare
Coronal mass ejections.
Sunlight
Delayed first sunlight.
Multi-Star System
Planet orbiting multiple stars.
Starlight
Luminosity varies with stage.
Sirius
Distance in light-years and radius.
Stars Wobble
Around barycenter.
