An ultramassive black hole so huge it could swallow 30 billion suns has emerged from the cosmic background, revealed not by ...

For more than a century, gravity and quantum physics have stubbornly resisted a common language, one describing the smooth ...

Its last close encounter was in mid-September, the closest one yet, passing just 3.8 million miles from the solar surface. It passed through the boundary between outer space and the region where the ...