Solar spicules as imaged by NASA's Solar Dynamics Observatory (NASA) There’s one recurring question I’ve been asking for nearly a decade: Why is the Sun’s corona (its atmosphere) so hot? When asking this out loud I inevitably get the sarcastic “um, because the Sun is…...

There’s not a lot to add to this video, it’s too awesome. It was captured by NASA’s converted DC-8 jet that was flying over Australia when the Japanese Hayabusa spacecraft broke up during re-entry. I’ll let the video do the rest of the talking: Oh yes, and that little dot ahead...

Hayabusa re-enters over the Australian Outback, generating a bright fireball (screen grabs from the JAXA video feed) Staring hard at the live streaming video of the black Australian skies, I was hoping to see a faint streak of light glide across the camera’s field of view. But no, it wasn’t...