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A gallery of four Planetary Nebulas, in this composite image, shows X-ray emission from Chandra colored purple, and optical emission from the Hubble Space Telescope
The Ring Nebula – M57 – is probably the most famous celestial band (except for the rings of Saturn). Expansive looping structures are seen to
Astronomers have used ESO’s Very Large Telescope to image a colossal star that belongs to one of the rarest classes of stars in the Universe,
Reflection nebulas reflect light from a nearby star. Many small carbon grains in the nebula reflect the light. The blue color typical of reflection nebula
A striking new image of the Helix Nebula from ESO’s VISTA telescope (image top), at the Paranal Observatory in Chile. This picture, taken in infrared
Charles Messier was compiling a list of diffuse objects not to be confused with comets. The 27th object on Messier’s list, now known as M27
Few butterflies have a wingspan this big. The bright clusters and nebulae of planet Earth’s night sky are often named for flowers or insects, and
NGC 3132 is a striking example of a planetary nebula. This expanding cloud of gas, surrounding a dying star, is known to amateur astronomers in
What could cause a nebula to appear square? No one is quite sure. The hot star system known as MWC 922, however, appears to be
The nearly perfect spherical nature of Abell 39, about 7000 light years away, is a ghostly remnant of a Sun-like star and one of the
