star, light-year, telescope, appear, relative
sun, gravity, radiant energy, overcome
Telescopes: https://www.youtube.com/watch?v=jAFrlzOtz-Y&feature=youtu.be
Stars: https://www.youtube.com/watch?v=lSuAPFMXcYM&feature=youtu.be
Why do Stars shine?: https://www.youtube.com/watch?v=WhXvbvava-k&feature=youtu.be
The Sun: https://www.flocabulary.com/unit/sun/video/
Constellations: https://www.youtube.com/watch?v=1sZ15SUeS9w&feature=youtu.be