This is a rare look at tropical DNA, courtesy of an ancient giant tortoise that tumbled into a sinkhole 1,000 years ago.
The fossil skull of the Bahamian tortoise, which yielded the first ancient tropical DNA. Photo courtesy of Nancy Albury via UF News.
The Dog Star, Sirius, is easy to spot because it’s the sky’s brightest star. Procyon – the other Dog Star – is near its brighter brother on the sky’s dome.
Image via Yunji Kitahara
When you see spacecraft images of craters on other worlds, do you sometimes think they look like domes? Here’s how to change your perception.
Barringer Meteor Crater. Photo courtesy of D. Roddy and the Lunar and Planetary Institute/ APOD.
Supernova 1987A first appeared in earthly skies 30 years ago today. It was the closest observed supernova since 1604.
A Red/Green/Blue overlay of optical, X-Ray and radio observations made by 3 different telescopes. In red are the 7-mm (44GHz) observations made with the Australian Compact Array in New South Wales, in green are the optical observations made by the Hubble Space Telescope, and in blue is an X-ray view of the remnant, observed by Nasa's space based Chandra X-ray Observatory.
Big discovery! NASA’s Spitzer Space Telescope has revealed 7 Earth-sized planets orbiting a tiny star only 40 light-years away. Three of them are firmly in the habitable zone.
This illustration shows the possible surface of TRAPPIST-1f, one of the newly discovered planets in the TRAPPIST-1 system. Scientists using the Spitzer Space Telescope and ground-based telescopes have discovered that there are seven Earth-size planets in the system. Image via NASA/JPL-Caltech
The newly discovered exoplanets orbiting this nearby star are likely to be bathed in high-energy ultraviolet radiation. What would life be like there? An expert explains.
A long-lost land mass is submerged in the depths of the southwestern Pacific Ocean. Should it be recognized as a full-fledged continent?
New Zealand in sunglint, via NASA Earth Observatory.
The Age of Aquarius starts when the vernal equinox point moves out of constellation Pisces and into Aquarius. When will that be? There’s no definitive answer.
Leonardo da Vinci's famous Vitruvian Man, a drawing created circa 1487, with the 7 chakras or energy centers indicated. Image via Wikimedia Commons
A waning crescent moon is sometimes called an old moon. It’s seen in the east before dawn. Next new moon is February 26 at 14:58 UTC.
Waning crescent moon with earthshine on January 23, 2017 from Patrick Casaert in Meaux, France.