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Can we stop Earth from heating up?A high-altitude balloon mission would investigate a controversial way to reduce global temperatures.
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A 'strange signal' is coming from the Milky Way. What's causing it?A fast radio burst was detected from within our galaxy for the first time. We may be closer to uncovering its origin.
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Was Einstein wrong? Why some astrophysicists are questioning the theory of space-timeTo better understand the universe, we may need to kill off one of the most important theories of all time.
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Some of the universe's stars have gone missing. But where did they go?An international team of astronomers is on the hunt for objects that should be impossible.
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Photos: 10 extraordinary ocean worlds in our solar systemPack your bathing costume — our solar neighborhood is much wetter than you think.
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Roswell UFO crash: What is the truth behind the 'flying saucer' incident?Did an unidentified flying object really crash land at a New Mexico ranch in 1947, only to be hushed up by the government?
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Images: 10 incredible volcanoes in our solar systemThese violent openings are windows into the inner workings and origins of our neighboring planets and their moons.
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Can our brains help prove the universe is conscious?Leading scientists have long pondered how matter gives rise to our subjective experience of reality and believe consciousness could even permeate space and time.
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Yuri Gagarin: How the first man in space sparked a conspiracy theoryGagarin became the first of humankind to blast off into space on April 12, 1961, but rumors continue to circulate that another cosmonaut had beaten him to the punch days before.
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What was the Star of Bethlehem?According to the New Testament, the Star of Bethlehem led the three wise men to Jesus' birth. Here are a few theories about what the star really was.
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There's Something Strange Going On Inside NeptuneNeptune is warmer than Uranus and astronomers are trying to figure out why.
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The Black Knight Satellite: A Hodgepodge of Alien Conspiracy TheoriesSome think it could be an extraterrestrial spacecraft — but is it?
