Astronomers are once again getting excited about a rare nova that could appear in the night sky anytime from now into the ...

During a nova event, explains NASA, energy explodes from a white dwarf star. Hounsell said white dwarf ... extremely powerful — not as strong as a black hole, according to the Adler Planetarium ...

NASA released some striking new images on Wednesday, including a bold rendition of Mars and a stunning photo of a moth-shaped nebula with a white dwarf star in the middle. Built by Lockheed Martin ...