Skytalk Archive

Mars’ close approach is Tuesday, July 31. A large subglacial lake of (very salty) liquid water has been found on Mars. This conclus ...

Scientists have discovered 12 more of Jupiter’s moons, bringing the planet’s total count to 79. There are 175 known moons in ...

Follow a replay of the NASA lunar exploration events from 49 years ago online. ...

Japan’s Hayabusa 2 spacecraft arrives at asteroid Ryugu on Wednesday, beginning a string of encounters including fly-bys, ...

Independence Day is sandwiched between the start of the dog days of summer and Aphelion. The dog days of summer are traditionally ...

Dave Heller and Derrick Pitts, chief astronomer at the Franklin Institute, discuss efforts to peer all the way back in time and space wit ...

Tomorrow evening at the University of Pennsylvania’s David Rittenhouse Laboratory, Derrick is moderating a panel discussion for asp ...

As we approach Summer Solstice, vertical shadows come to their shortest length. Stepping out for lunch with your work colleagues tomorrow ...

Daylight lasts 14 hours and 52 minutes now, and the rate at which we’re gaining daylight is slowing dramatically. The rate at which we ...

An especially carnivorous supermassive black hole sitting at the center of a galaxy is gobbling galactic gases at an astonishing rate ...

Is the current volcanic activity in Hawaii possible elsewhere in the solar system? Mercury, Venus, and Mars no longer have volcani ...

Newly discovered? A purple planet! Actually, the color suggestion is just speculation based on the planet’s expected chemical compo ...

Our sun, like so many others, was born as part of a cluster of stars. Sibling stars have the same chemical composition and can be discove ...

Scientists at the University of Washington have developed the tech to ‘see’ what could be a low-mass particle responsible for ...

Astronomers have detected a galaxy that seems to be devoid of dark matter. That possibility has theorists re-evaluating gravity’s r ...