Nebular hypothesis
Videos
The nebular hypothesis is the most widely accepted model in the field of cosmogony to explain the formation and evolution of the Solar System. It suggests the Solar System was formed from gas and dust
Dusty disks surrounding nearby young stars in greater detail.
The visible-light (left) and infrared (right) views of the Trifid Nebula—a giant star-forming cloud of gas and dust located 5,400 light-years away in the constellation Sagittarius
Infrared image of the molecular outflow from an otherwise hidden newborn star HH 46/47
Debris disks detected in HST archival images of young stars, HD 141943 and HD 191089, using improved imaging processes (24 April 2014).
Exocomet
Videos
An exocomet, or extrasolar comet, is a comet outside the Solar System, which includes rogue comets and comets that orbit stars other than the Sun. The first exocomets were detected in 1987 around Beta
Exocomets and various planet-formation processes around Beta Pictoris, a very young A-type main-sequence star (NASA; artist's conception).
Artist's impression of exocomets plunging into young star HD 172555.
Artist's impression of an exocomet falling into white dwarf WD 1425+540.
Hyakutake Color