NASA's Hubble Sees a Stranger in the Crowd
The constellation of Virgo (The Virgin) is the largest of the Zodiac
constellations, and the second largest overall after Hydra (The Water Snake).
Its most appealing feature, however, is the sheer number of galaxies that lie
within it. In this picture, among a crowd of face- and edge-on spiral,
elliptical, and irregular galaxies, lies NGC 4866, a lenticular galaxy situated
about 80 million light-years from Earth.
Lenticular galaxies are somewhere between spirals and ellipticals in terms of
shape and properties. From the picture, we can appreciate the bright central
bulge of NGC 4866, which contains primarily old stars, but no spiral arms are
visible. The galaxy is seen from Earth as almost edge-on, meaning that the disc
structure — a feature not present in elliptical galaxies — is clearly visible.
Faint dust lanes trace across NGC 4866 in this image, obscuring part of the
galaxy’s light.
To the right of the galaxy is a very bright star that appears to lie within
NGC 4866’s halo. However, this star actually lies much closer to us; in front of
the galaxy, along our line of sight. These kinds of perspective tricks are
common when observing, and can initially deceive astronomers as to the true
nature and position of objects such as galaxies, stars, and clusters.
This sharp image of NGC 4866 was captured by the Advanced Camera for Surveys,
an instrument on the NASA/ESA Hubble Space Telescope.
Image Credit: European Space
Agency
NASA
Guillermo Gonzalo Sánchez Achutegui
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