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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 ...
January 14, 2021
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...
August 13, 2020
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.
June 2, 2014
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.
May 28, 2014
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.
May 28, 2014
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.
January 13, 2014
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.
October 29, 2013
Draconid meteors
A couple of Draconid meteors caught on camera by Richard Turner in early October, 2011.
October 7, 2013
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.
September 17, 2013
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.
September 16, 2013
