Magazine

Science

Astronomers have estimated star diameters from their colors and brightnesses, but modern interferometers can measure them directly. How do the two methods compare?

Observing, Science

Phil Harrington’s binocular universe: It’s a Wonderful Star

Science

See extremophiles on Earth

Observing, Science

A grand conjunction

Science

Could a dwarf galaxy merging with the Milky Way have triggered the solar system’s formation?

Observing

Binocular universe web extra: Estimating Mira’s magnitude

Science

People across town heard a window-rattling sonic boom from the February 19 fireball here, but we heard nothing. Why?

Science

Bob Berman’s strange universe: A piece of π

Science

Why doesn’t Astronomy magazine recognize Messier 110?

Galaxies

Why do colliding spiral galaxies make an elliptical galaxy instead of a larger spiral?

Observing, Science

Phil Harrington’s binocular universe: Calling on Cassiopeia

Science

Venus and Jupiter meet again