Five-Time Supernova Discovery May Solve a Century-Old Cosmic Mystery

An extraordinarily rare, gravitationally lensed supernova may offer a powerful new way to measure the universe’s expansion rate. Astronomers have known for nearly a century that the universe is expanding. What remains uncertain is the exact speed of that expansion. The value, called the Hubble constant, is still fiercely debated and has even raised questions […] Read More