But what does that mean? The simple answer is how heavy something is for its size. If something seems very heavy for its size (like a heavy metal object), we say it is more dense. If something seems ...

Scientists have detected emanating from the nucleus of a galaxy relatively close to our Milky Way flashes of X-rays gradually ...

An international team of astronomers has reported the detection of a new exoplanet orbiting a bright late F-type star. The ...

The dense stellar remnant would, if confirmed, be the closest known object to any black hole, according to preliminary ...