Red dwarf star with large convective cells at left, while at right looms the bulk of an Earth-size terrestrial planet colored in mottled brown and hanging onto a thin, blue veneer of an atmosphere

Exoplanets

Astronomers Discover New Earth-size World Only 40 Light-Years Away

This nearby terrestrial world might just reveal the secrets of atmospheric composition and habitability for planets like Earth and Venus.

Orion in glass plate form

Astronomy and Society

A Century of Sky, Digitized

The Harvard College Observatory's glass plates, which record a century of changes in the sky, have now been converted into digital form.

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