NASAのインスタグラム(nasa) - 10月2日 01時36分

The dark side of…a galaxy. The shining disk of a spiral galaxy sits approximately 25 million light-years away from Earth. Vivid details like the blue bursts of young stars, dark lanes of cosmic dust and red bubbles of hydrogen gas can be seen throughout the galaxy’s spiral arms.

However, there may be more to this picture than first meets the eye. Astronomers suspect that spiral galaxies like this one are surrounded by, and contained within, extended haloes of dark matter. Dark matter is a mysterious substance that cannot be seen; instead, it reveals itself via its gravitational interactions with surrounding material.
CREDIT: NASA/ESA

#nasa #space #hubble #hubblespacetelescope #telescope #galaxy #lightyears #universe #esa

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