Astronomers have detected mysterious X-ray signals coming from a nearby white dwarf star for more than 40 years. We may now ...

(Neither Titan nor the Crab Nebula are visible to the unaided eye, but with a dark sky and cooperative weather, you can find them with binoculars.) The explosion stripped off the star's outer ...

The Helix Nebula, 650 light-years away, resembles a cosmic eye formed by a dying star’s outer layers shedding.

But the Orion Nebula also has a dark side ... But you can easily train the eye to reverse the view. It's an illuminating experience that reveals a dark dimension to this familiar object.

In 1920, astronomers Harlow Shapley and Heber Curtis held a Great Debate. Shapley argued that the spiral nebulae were small and in the Milky Way, while Curtis took a more radical position that they ...

Little Dumbbell Nebula (also known as Messier 76, M76, or NGC 650/651) located 3,400 light-years away in the northern circumpolar constellation Perseus. It is classified as a planetary nebula, an ...

As it nears 35 consecutive years of space service, the NASA/ESA Hubble Space Telescope has taken another look at a famous ...

On Feb. 28, seven planets—Mars, Jupiter, Uranus, Venus, Neptune, Mercury, and Saturn—will all grace the early evening sky.

The bright variable star V 372 Orionis takes center stage in this Hubble Space Telescope image, which has also captured a smaller companion star in the upper left of this image.

The Andromeda nebula, M31, was a prominent example. It’s visible to the naked eye from a dark site. Astronomers as far back as the mid-18th century had speculated that some nebulae might be remo ...

Clearly, the Andromeda Nebula was a system of stars quite separate ... Two of them, the Magellanic Clouds, can be seen with the naked eye from Earth's southern hemisphere. They look like detached ...