More astrophysics illustrations

Astrophysics

Ellipse semimajor axis

Astrophysics

Planck function curve

Astrophysics

Letter z

Astrophysics

Equipotential surface figure eight

Astrophysics

Distance element dz

Astrophysics

Calcium h line redshifted

Astrophysics

Telescope lens

Astrophysics

Spiral galaxy