From phone boxes and flux capacitors to black holes and hot tubs, sci-fi has created plenty of ways to explore the fourth ...

Back in the prehistoric days of theoretical astrophysics (1985), in a mystical and exotic corner of planet Earth (Fresno, California), a man sat in the back of a car and tried to break the spacetime ...

They discovered that these wormholes can serve as time machines, invoking time-travel paradoxes—evidence that exotic material is forbidden in nature. Now, decades later, a new species of traversable ...

Centuries before anyone pointed a telescope at the sky, Isaac Newton figured out how gravity works. He showed that any object with mass pulls on every other object—a result that explained falling ...

The results reveal that our universe is reverberating with cosmic collisions. Some of the waves stem from pairs of black holes colliding, and others appear to have come from crashing black holes and ...

New observations reveal that the relationship between ultraviolet and X-ray light in quasars has changed over billions of years. This unexpected shift suggests the structure around supermassive black ...