Comet ISON is now thought to be a traveling debris field, with no solid nucleus or core. Will we see the debris field from Earth? No one knows yet.
The Saturn hexagon is a unique six-sided jet stream, a current of air, around Saturn’s north pole.
Astronomers used the Subaru Telescope to capture this image of Comet Lovejoy’s tail on December 3, 2013. This comet is now visible in earthly skies.
Comet ISON has fizzled. It’s now thought to be a traveling debris field, with no solid core. Meanwhile, you can Comet Lovejoy in dark skies. The Big Dipper can help you find it.
The discovery of a giant planet orbiting its star at 650 times the average Earth-sun distance has astronomers puzzled over how such a strange system came to be.
No matter where you live worldwide, Geminid meteors will fall most abundantly after midnight on December 13 and 14, centered on 2 a.m. local time.
Want to try to capture a meteor on film? The first step is planning. The next step is to gather your equipment. Then on to the capture process itself.
Astronomers have spotted what appear to be two supermassive black holes 3.8 billion light-years from Earth, circling each other like dance partners.
What’s that very bright star or planet in the west after sunset now? It’s the planet Venus, now near its time of greatest brilliancy.
Next meteor shower – the Geminids on the mornings of December 13 and 14. It might be one of the year’s richest showers, if you avoid the moon.
More than a half a million people have signed up with NASA to receive alerts when the ISS flies overhead. Here’s how.
Venus pops out at dusk. Jupiter rises at early evening, and Mars comes up after midnight. Saturn before dawn. Info and charts here.
With proper coaxing, molecules in microgravity can assemble themselves into forms with surprising properties. This new NASA ScienceCast video explores the possibilities
Gas from a companion star is thought to feed a stellar-mass black hole’s voracious appetite, in the galaxy M101.
The next meteor shower is the Geminid shower, peaking on the mornings of December 13 and 14.
ISON’s moment of truth is here – its closest approach to the sun – today. Here are some ways to experience it online.
Places where hot new stars are born and die – and sculpt their surroundings into odd shapes – in the dwarf galaxy orbiting our own Milky Way.
Now ISON cannot be seen from Earth, but it’s coming into the field of view of a whole fleet of ESA and NASA space-based observatories.
Get the facts about comet ISON. The manager of NASA’s Near-Earth Object Program Office shares the low-down on the stellar object’s holiday travel plans.
The appearance of this “new star” stunned those who thought the heavens were constant and unchanging. At its brightest, the supernova rivaled Venus before fading from sight a year later.
“Improving the exploration of the magnetic field’s function and recording space weather data more accurately allows us to draw conclusions for life on our planet.” – Johanna Wanka