Posts by 

David Callejas

Ready, set, explore Earth from home

We're at home. How about you? But we just discovered these virtual tours, galleries and live webcams from around the world, which we wanted to share. Stay home, and have some virtual fun ...

Sometimes Island on Lake Travis

Known as the Sometimes Islands in Lake Travis, this strange string of islets appears and disappears from the water’s surface...

Two planets destined to die as their star expands

You know how our sun will someday swell to a red giant, swallowing the planets Mercury and Venus? These two distant exoplanets will suffer a similar fate.

Diamond planets more common than astronomers thought?

Study suggests that extraterrestrial worlds can be extremely diverse in their chemical compositions, including many that are drastically different from our earthly experience.

Habitable environment on Martian volcano?

A volcano erupting under an immense glacier would have created large lakes of liquid water on Mars in the relatively recent past. And where there’s water, there's the possibility of life.

Seeking safe havens for biodiversity, as climate changes

Australian researchers say their new technique will help them find sites where populations of organisms can potentially survive, as rainfall continues to decline.

Heat from the lava flows at Klyuchevskaya

A recently released NASA image of the ongoing 2013 eruption at Klyuchevskaya, one of Russia’s tallest and most active volcanoes.

Draconid meteors

A couple of Draconid meteors caught on camera by Richard Turner in early October, 2011.

Venus and Saturn above the fog

Venus and Saturn above the fog on Sunday September 15, 2013 about 65 minutes after sunset photographed by Bob King aka Astro Bob.

Infrared star trails over Texas

Star trails in the Texas night sky - in infrared, popularly known as "heat radiation" - from EarthSky Facebook friend Manish Mamtani Photography.