In 2015, scientists first detected gravitational waves - ripples in space caused by massive disturbances. Allan Adams says this discovery helps answer some of our biggest questions about the universe.
In our galaxy alone, there are hundreds of billions of planets. And Sara Seager is looking for the perfect one, a "Goldilocks" planet -- neither too hot nor too cold -- that could support life.
Natasha Hurley-Walker explains how a new radio telescope helps us "see" without light. She says these telescopes can tell us about millions of galaxies -- and maybe even the beginning of time.
Scientists believe at the center of every galaxy is a supermassive black hole. Jedidah Isler describes how gamma ray telescopes have expanded our knowledge of this mysterious aspect of space.