NASAのインスタグラム(nasa) - 10月24日 09時49分

Close Encounters: Comet Siding Spring Seen Next to Mars: This composite Hubble Space Telescope Image captures the positions of comet Siding Spring and Mars in a never-before-seen close passage of a comet by the Red Planet, which happened at 2:28 p.m. EDT Oct. 19, 2014. At that time, the comet and Mars were about 149 million miles from Earth.

The Mars and comet images have been added together to create a single picture to illustrate the angular separation, or distance, between the comet and Mars at closest approach. The separation is approximately 1.5 arc minutes, or one-twentieth of the angular diameter of the full moon. The background star field in this composite image is synthesized from ground-based telescope data provided by the Palomar Digital Sky Survey, which has been reprocessed to approximate Hubble's resolution.

Image Credit: NASA, ESA, PSI, JHU/APL, STScI/AURA

#nasa #space #hst #hubble #sidingspring #marscomet #mars #comet #telescope #planets #science
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