Two crescents meet

Occultations

Watch the Moon Pair Up with Venus on June 19th

Two crescents — the Moon and Venus — meet in the sky in the wee hours of June 19th.

Comet Triple Crown

Celestial Objects to Observe

Comet 46P/Wirtanen Approaches Earth

On December 16th, the comet will pass within 12 million kilometers of Earth and should brighten to about 3rd magnitude, though the diffuse coma and a nearly full Moon will make observations difficult.

Solar System

Solar Eclipse Made Bow Waves in Earth's Atmosphere

New research shows that the supersonic motion of the Moon's shadow across the continental U.S. in August 2017 created bow waves in Earth's atmosphere.

Moon's shadow from space

The 2017 Total Solar Eclipse

“Observe” August's Eclipse with Your AM Radio

When the Moon's shadow glides across the U.S. on August 21st, you'll have have a chance to hear the eclipse as it happens.

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