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Eta Carinae's great eruption in the 1840s created the billowing Homunculus Nebula, imaged here by Hubble. Now about a light-year long, the expanding cloud contains enough material to make at least 10 copies of our Sun. Astronomers cannot yet explain what caused this eruption. Credit: NASA, ESA, and the Hubble SM4 ERO Team

NASA’s NuSTAR mission proves superstar Eta Carinae shoots cosmic rays

Astronomers know that cosmic rays with energies more prominent than 1 billion electron volts (eV) come to us from beyond nearby planetary group. But...

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