Explanation:
The explosion is over but the consequences continue. About eleven thousand
years ago a star in the constellation of Vela could be seen to explode,
creating a strange point of light briefly visible to humans living near the
beginning of recorded history. The outer layers of the star crashed into the
interstellar medium, driving a shock wave that is still visible today. A roughly
spherical, expanding shock wave is visible in X-rays. The above image captures
some of that filamentary and gigantic shock in visible light. As gas flies away
from the detonated star, it decays and reacts with the interstellar medium,
producing light in many different colors and energy bands. Remaining at the
center of the Vela Supernova Remnant is a pulsar, a star as dense as nuclear
matter that rotates completely around more than ten times in a single second.
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