The magnificent spiral galaxy M99 fills the frame in this image from the NASA/ESA Hubble Space Telescope.
M99—which lies roughly 42 million light-years from Earth in the constellation Coma Berenices—is a “grand design” spiral galaxy, so-called because of the well-defined, prominent spiral arms visible in this image.
Hubble’s Wide Field Camera 3 captured M99 on two separate occasions, helping astronomers study two entirely different astronomical phenomena.
The image above includes data from both sets of observations.
The first set of observations aimed to explore a gap between two different varieties of cosmic explosions: novae and supernovae.