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The comet’s orbital period is short – only 3.3 years – and the orbit is relatively close to Earth. Encke’s Comet is now on its 63rd known visit to our part of space.
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.
Supernova 1987A first appeared in earthly skies 30 years ago today. It was the closest observed supernova since 1604.
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.
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.
In one second, this distant pulsar – the spinning remains of a once-massive star – emits the same amount of energy as that released by our sun in 3.5 years.
There might be an unknown 9th planet that orbits far from Earth, on the outer fringes of our solar system. You can help astronomers find it, if it exists!
On February 20, 1962, John Glenn became the 1st American to orbit Earth and the first American space hero.
SpaceX is scheduled to launch its Dragon spacecraft resupply mission to the International Space Station no earlier than 10:01 a.m. EST (1501 UTC) on Saturday, February 18. How to watch.
It’s hard to comprehend the sheer size of objects in space, but take 2 minutes and give it a try!
Will comet 73P/Schwassmann-Wachmann survive its March 16 sweep near the sun, or disintegrate into a trail of cosmic dust?
During Friday’s penumbral eclipse of the moon, an observer in Puerto Rico captured images of a black disk moving across the moon’s face.
Theoretical studies predict 100 million to 1 billion black holes in our Milky Way galaxy. So far, astronomers have found about 60. A serendipitous discovery could lead to finding more.
Green Comet 45P has been in our sky for months and passed closest on February 11, 2017. It’s a faint one, but intrepid astronomers have captured some wonderful images!
Space visionaries might have figured out a way to travel within decades to the nearest star system, Alpha Centauri. But, once we get there, how do we slow down?
In 1 calendar month, 3 eclipses are rare. But in 1 lunar month, 3 eclipses are are more common. From 2000-2050, it happens 14 times.
This year, in 2017, there are 12 full moons and 12 new moons, but only four eclipses – two lunar and two solar.
Early Monday morning, thousands of people across multiple northern U.S. states watched a brilliant meteor streak across the sky. It then plunged into Lake Michigan.
The February 9, 1913 meteors crossed the sky in formation, on nearly identical paths. Their pace across the sky was described as “stately” and “measured.”
Retrograde motion of Jupiter or Mars or Saturn in our sky is an illusion, caused by Earth’s passing these slower-moving outer worlds. But there’s a real retrograde motion, too.
February 26 ring of fire eclipse
Favorite photos: Ring of fire eclipse