NGC 4689

NGC 4689 is a spiral galaxy located about 54 million light-years away in the constellation of Coma Berenices and a member of the Virgo Cluster of galaxies.

The galaxy’s star forming disk has been truncated which has caused the amount of star formation to be significantly reduced. The truncation may have been the result of interaction with other galaxies in the Virgo Cluster which caused the galaxy to lose much of its interstellar gas and dust, the fuel for new star formation. NGC 4689 has been classified as an Anemic galaxy because its lack of material for making new stars.

Image Credit: NASA / ESA

NGC 5468

We see the galaxies around us in various orientations. NGC 5468 is a spiral galaxy which we see with an almost dead-on top-down view. Over the last couple of decades, NGC 5468 has hosted a number of supernovae: SN 1999cp, SN 2002cr, SN2002ed, SN2005P and SN2018dfg. Despite being just over 130 million light-years away, the  face-on orientation of the galaxy with respect to us makes it easier to spot such new “stars” as they appear.

Image Credit: NASA / ESA