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.
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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.
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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.
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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.
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