保护地球，探索宇宙，发现文明
2023年11月10日 UHZ1: Distant Galaxy and Black Hole Image Credit: X-ray: NASA/CXC/SAO/Ákos Bogdán; Infrared: NASA/ESA/CSA/STScI; Image Processing: NASA/CXC/SAO/L. Frattare & K. Arcand Explanation: Dominated by dark matter, massive cluster of galaxies Abell 2744 is known to some as Pandora’s Cluster. It lies 3.5 billion light-years away toward the cons...
2023年6月1日 Recycling Cassiopeia A Image Credit: X-ray – NASA, CXC, SAO; Optical – NASA,STScI Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After a few million years, the enriched material is blasted back into int...
2022年10月17日 X-Ray Rings Around a Gamma Ray Burst Image Credit: NASA Swift Obs.; Data: B. Cenko (NASA’s GSFC), A. Beardmore (U. Leicester) et al.; Processing: J. Miller (U. Michigan) Explanation: Why would x-ray rings appear around a gamma-ray burst? The surprising answer has little to do with the explosion itself but rather with light reflected off are...
2021年11月23日 The Sun in X-rays from NuSTAR Image Credit: NASA, NuSTAR, SDO Explanation: Why are the regions above sunspots so hot? Sunspots themselves are a bit cooler than the surrounding solar surface because the magnetic fields that create them reduce convective heating. It is therefore unusual that regions overhead — even much higher up in the Sun&#...
2021年11月19日 NGC 281: Starless with Stars Image Credit & Copyright: Wido Oerlemans – X-ray: Chandra, Infrared: Spitzer Explanation: In visible light the stars have been removed from this narrow-band image of NGC 281, a star forming region some 10,000 light-years away toward the constellation Cassiopeia. Stars were digitally added back to the result...
2021年01月23日 Recycling Cassiopeia A Image Credit: X-ray – NASA, CXC, SAO; Optical – NASA,STScI Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After a few million years, the enriched material is blasted back into i...
2020 June 23 The X-Ray Sky from eROSITA Image Credit & Copyright: J. Sanders, H. Brunner, A. Merloni & eSASS Team (MPE); E. Churazov, M. Gilfanov, R. Sunyaev (IKI) Explanation: What if you could see X-rays? The night sky would seem a strange and unfamiliar place. X-rays are about 1,000 times more energetic than visible light photons and are produce...
2020 March 11 An Extreme Black Hole Outburst Image Credit: X-ray: Chandra: NASA/CXC/NRL/S. Giacintucci, et al., XMM-Newton: ESA/XMM-Newton; Radio: NCRA/TIFR/GMRT; Infrared: 2MASS/UMass/IPAC-Caltech/NASA/NSF; Text: Michael F. Corcoran (NASA, Catholic U., HEAPOW) Explanation: Astronomers believe they have now found the most powerful example of a black hole out...
2019 September 6 Recycling Cassiopeia A Image Credit: X-ray – NASA, CXC, SAO; Optical – NASA,STScI Explanation: Massive stars in our Milky Way Galaxy live spectacular lives. Collapsing from vast cosmic clouds, their nuclear furnaces ignite and create heavy elements in their cores. After a few million years, the enriched material is blasted back i...
2019 August 1 Elements in the Aftermath Image Credit: NASA/CXC/SAO Explanation: Massive stars spend their brief lives furiously burning nuclear fuel. Through fusion at extreme temperatures and densities surrounding the stellar core, nuclei of light elements ike Hydrogen and Helium are combined to heavier elements like Carbon, Oxygen, etc. in a progression wh...