We know almost nothing about 96% of the universe, composed of dark matter and energy. See how scientists are trying to unravel these two great mysteries of cosmology.
The deeper explorers descend into the ocean, the more mysteries they encounter: underwater lakes and waterfalls, active volcanoes, towering mountain ranges, and a host of animals thriving in the darkest, most inhospitable environments. David Gallo estimates that 95% of Earth’s ocean is virtually unexplored and unknown, and says we don’t know planet Earth.
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Astronomers generally accept that the universe started approximately 13.7 billion years ago from a compressed state and then expanded rapidly. That expansion still continues today. But what is it expanding into? And if it is expanding into something, what is it that’s outside of the universe?
But first, the term ‘expanding’ should be clarified. (more…)
Many of today’s inventions were first created in the minds of visionary science fiction writers. In this episode of SciShow, Hank talks about the origins of four of these:
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