Scientists find gravitational waves. Or wait, maybe not.

In March, a group of astrophysicists announced one of the biggest discoveries in the field in decades: using a telescope at the South Pole, they'd found evidence of gravitational waves in space. These would have confirmed a crucial part of the Big Bang theory — and solidified our understanding of the formation of the universe.
Except, as it turned out, the discovery was probably wrong. Subsequent work has shown that the signal originally detected was likely the effect of dust scattered throughout the galaxy. The debate hasn't been settled yet, but in all likelihood, scientists will have to keep searching for gravitational waves.