The police in Bangor, Maine, said all six people on a private business jet are presumed dead after the plane crashed in a snowstorm at Bangor International Airport.
Minnesota authorities said the Department of Homeland Security blocked them from accessing the scene after Alex Pretti was shot and killed by a Border Patrol agent Saturday in Minneapolis. Rosa Brooks, law professor at Georgetown University, joined CBS News to discuss the investigation.
Dark matter doesn't absorb or give off light so scientists can't study it directly. But they can observe how its gravity warps and bends the star stuff around it.
