Credit: ESA/Hubble & NASA
Acknowledgement: Luca Limatola
Acknowledgement: Luca Limatola
Astronomical pictures sometimes deceive us with tricks of
perspective. Right in the centre of this image, two spiral galaxies
appear to be suffering a spectacular collision, with a host of stars
appearing to flee the scene of the crash in a chaotic stampede.
However, this is just a trick of perspective. It is true that two
spiral galaxies are colliding, but they are millions of light-years
away, far beyond the cloud of blue and red stars near the merging
spiral. This sprinkling of stars is actually an isolated, irregular
dwarf galaxy named ESO 489-056. The dwarf galaxy is actually much more
distant than many bright stars in the foreground of the image, which are
located much closer to us, in the Milky Way.
ESO 489-056 is located 16 million light-years from Earth in the
constellation of Canis Major (The Greater Dog), in our local Universe.
It is composed of a few billion red and blue stars — a very small number
when compared to galaxies like the Milky Way, which is estimated to
contain around 200 to 400 billion stars, or the Andromeda Galaxy, which
contains a mind-boggling one trillion.
A version of this image was entered into the Hubble's Hidden Treasures image processing competition by contestant Luca Limatola.
Source: ESA/Hubble - Space Telescope
