This new propulsion system could rewrite the rules of spaceflight—not to mention completely defy conventional physics.

A recent study has investigated teleparallel gravity and ... is known as the Hubble constant, which describes the proportionality between the distance of a galaxy from Earth and the velocity ...

The visible universe—including Earth, the sun ... According to Einstein, the constant would be a repulsive force that counteracts gravity, keeping the universe from collapsing in on itself.

When teachers explain ocean tides, they frequently describe how the moon's gravity pulls on Earth and all of its water. This, they often say, leads to a gravitational imbalance, which stretches ...

Earth’s surface experiences a slight rise and fall—a phenomenon almost imperceptible to human senses, yet one that reveals a ...