2017 November 8
NGC 2261: Hubble's Variable Nebula
Data: Mark Clampin
What causes Hubble's Variable Nebula to vary?
The unusual nebula featured here changes its appearance noticeably in just a few weeks.
Discovered over 200 years ago and subsequently
cataloged as NGC 2261,
the remarkable nebula is named for
Edwin Hubble, who
early last century.
Fitting, perhaps, the
featured image was taken by another namesake of Hubble: the
Hubble's Variable Nebula is a
made of gas and fine
dust fanning out from the star
The faint nebula is about one
light-year across and lies about 2500 light-years away towards the
constellation of the
variability explanation for
Hubble's Variable Nebula holds that dense knots
of opaque dust pass close to
R Mon and cast
moving shadows onto the reflecting dust seen in the rest of