NASA Just Dropped Its Most Detailed Video Tour of the Moon Yet

Galaxy seems to lack dark matter, stumping astronomers

Dark matter and galaxies normally go hand in hand. Dark matter seems to be needed to draw in sufficient material to form the galaxy and its stars, and halos of dark matter keep galaxies from spinning apart as they rotate. So scientists were more than a bit surprised to find a galaxy that has little to no dark matter at all.

Could We Actually Nuke an Asteroid to Save Earth?

Two recent papers anticipate how nukes could be employed to either deflect an asteroid on a collision course with Earth, or blow it into smaller, less hazardous chunks. One, published in Acta Astronautica, proposes a vehicle called the Hypervelocity Asteroid Mitigation Mission for Emergency Response (HAMMER), which could be deployed to nudge asteroids away from Earth, or in a worst case scenario, as a delivery mechanism for a nuclear device.

This spacecraft will get closer to the Sun than any before it—without melting