A cosmic filament, 3 million light-years long, has been directly imaged for the first time — offering a new glimpse into the ...

Matter has mass, creating the force of gravity ... According to NASA, this image from the Hubble Space Telescope indicates that a huge ring of dark matter probably surrounds the center of the ...

But what's an atom made of? What is matter, really? Matter is defined as that which 1) has mass and 2) has volume or takes up ...