The event saw participants of all fitness levels join in on this unforgettable experience, with the road becoming a massive, vibrant running track. Early Sunday morning, the excitement kicked off ...

Does light behave more like a particle, or like a wave? Today we know the surprising answer. Here's why it took so long to get there. From the most distant stars in the sky to the screen in front ...

The universe is too vast to track distances on the scale of miles, so astronomers use light-years to convey the great lengths between cosmic objects. A light-year is the distance light can travel ...