Over 2 decades of Chandra X-ray Observatory views of the Crab Nebula and Cassiopeia A have been time-lapsed. The Chandra team explains here.
Credit: NASA/CXC/A. Hobart
Credit: NASA/CXC/A. Hobart
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00:00Visit Chandra's Beautiful Universe
00:05Crab Nebula and Cassiopeia A
00:08New movies of two of the most famous objects in the sky, the Crab Nebula and Cassiopeia A,
00:16are being released from NASA's Chandra X-ray Observatory.
00:19Each includes X-ray data collected by Chandra over about two decades.
00:24They show dramatic changes in the debris and radiation remaining
00:27after the explosion of two massive stars in our galaxy.
00:32The Crab Nebula, the result of a bright supernova explosion
00:36seen by Chinese and other astronomers in the year 1054, is 6,500 light-years from Earth.
00:43At its center is a neutron star, a super-dense star produced by the supernova.
00:48As it rotates at about 30 times per second,
00:51its beam of radiation passes over the Earth every orbit, like a cosmic lighthouse.
00:56As the young pulsar slows down, large amounts of energy are injected into its surroundings.
01:03In particular, a high-speed wind of matter and antimatter particles plows into the surrounding
01:07nebula, creating a shockwave that forms the expanding ring seen in the movie.
01:13Jets from the poles of the pulsar spew X-ray-emitting matter and antimatter particles
01:17in a direction perpendicular to the ring.
01:21Over 22 years, Chandra has taken many observations of the Crab Nebula.
01:26With this long runtime, astronomers see clear changes in both the ring and the jets in the new movie.
01:33Previous Chandra movies showed images taken from much shorter time periods,
01:37a five-month period between 2000 and 2001,
01:41and over seven months between 2010 and 2011 for another.
01:46The longer time frame highlights mesmerizing fluctuations,
01:50including whip-like variations in the X-ray jet
01:52that are only seen in this much longer movie.
01:55A new set of Chandra observations will be conducted later this year
02:00to follow changes in the jet since the last Chandra data was obtained in early 2022.
02:07The second billing in this doubleheader is just as spectacular.
02:12Cassiopeia A, or Cass A for short,
02:15is the remains of a supernova
02:16that is estimated to have exploded about 340 years ago in Earth's sky.
02:21While other Chandra movies of Cass A have previously been released,
02:27including one with data extending from 2000 to 2013,
02:31this new movie is substantially longer,
02:34featuring data from 2000 through 2019.
02:38The outer region of Cass A shows the expanding blast wave of the explosion.
02:43The blast wave is composed of shock waves,
02:46similar to the sonic booms generated by a supersonic aircraft.
02:49These expanding shock waves are sites
02:53where particles are being accelerated to energies
02:55that are higher than the most powerful accelerator on Earth,
02:58the Large Hadron Collider.
03:01As the blast wave travels outwards,
03:03it encounters surrounding material and slows down,
03:06generating a second shock wave that travels backwards relative to the blast wave,
03:11analogous to a traffic jam traveling backwards
03:13from the scene of an accident on a highway.
03:15These two movies show Chandra's capabilities
03:20of documenting changes in astronomical objects over human time frames.
03:25Such movies would not be possible without Chandra's archives
03:28that serve as public repositories for the data collected
03:31over Chandra's nearly 25 years of operations.
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