A new study has revealed that the remnants of Cassiopeia A, one of the Milky Way’s most famous star explosions, are not expanding evenly in all directions. About 11,000 light-years away.
According to the British newspaper, “Daily Mail”, a study of 19 years of data from the Chandra X-ray Observatory, which orbits 85,000 miles above Earth, helped the team better understand the expansion of the nebula, and find the interior regions that are not expanding at all unlike regions external.
Only two things can explain this unexpected behavior, here is a hole in the nebula that creates a vacuum or collides with something, and computer models support the idea of a collision between the nebula and another celestial body.
The star’s shock wave, the team said, hit a shell of gas particles that formed when the dead star blew out an erratic wind of gas.
When the light from the explosion reached Earth in the 17th century, there was so much gas and dust surrounding the star that it could be seen with the naked eye or the primary telescopes of the time.
The Cassiopeia A nebula is expanding at an average rate of 8.6 million to 13.3 million miles per hour and has a temperature of 54 million degrees Fahrenheit.
The team explained that this expansion likely occurs in the gas that was blown up by the star long before the explosion, saying that it spans 16 light-years.