We all know that objects can absorb and reflect electromagnetic waves. It stands to reason the same might be true for gravitational waves.

It is an everyday experience: You have placed an object a tiny little bit too much over the edge of a table and it falls down. This is the case when the center of gravity is above the floor and not above the table. But what if the center of gravity of the object is exactly on the boundary of the ...

As far as i know, a proton turns into a neutron by emitting a positron. How does that work? Shouldn't a proton be slightly heavier than a neutron? This seems to violate the laws of thermodynamics. A positron can't have negative mass either. This produces energy while increasing it's own mass and ...