Comet C/2014 Q2 (Lovejoy)

Explanation: Comet C/2014 Q2 (Lovejoy) is one of more than 32 comets imaged by NASA's NEOWISE mission from December 2013 to December 2014. This image of comet Lovejoy combines a series of observations made in November 2013, when comet Lovejoy was 1.7 astronomical units from the sun. The image spans half of one degree. It shows the comet moving in a mostly west and slightly south direction. The red color is caused by the strong signal in the NEOWISE 4.6-micron wavelength detector, owing to a combination of gas and dust in the comet's coma.

Pluto

Image credit: NASA/JPL-Caltech.