Astrophysics
Stars, celestial phenomena, and cosmic distances
Stellar Distances
16 Aug 2018
How astronomers measure cosmic distances — parallax, Cepheids, and Hubble's Law.
astrophysicsparallaxdistance laddercosmology
What is a Lunar Eclipse?
2 Feb 2018
Penumbral, partial, and total eclipses — plus the rare Super Blue Blood Moon.
astrophysicsmooneclipseblood moon
What Are Shooting Stars?
23 Nov 2017
Meteoroids, meteors, and meteorites — space rocks burning up in Earth's atmosphere.
astrophysicsmeteorsmeteor showers