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Some think infinitesimal particles called gravitons exude the force in all matter, but whether or not they could ever be detected is questionable.
Still, a massive hunt is on for major shake-ups in the universe called gravitational waves. If detected (perhaps from a merger of black holes), Albert Einstein's concept that the universe has a "fabric" of spacetime would be on solid ground.
Caption: Artist depiction of gravity waves around merging black holes. Credit: NASA
and energy abound in the universe, but only in a few places is the roll of the cosmic dice perfect enough to
The basic ingredients and conditions necessary for this strange phenomenon are better understood than ever before, thanks to abundant access to on Earth.
But the exact recipe -- or to go from the basic elements of carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur to an organism is a prevailing mystery.
Scientists seek out new areas in the solar system where life could have thrived (or still may, such as below the surface of watery moons), in hopes of arriving at a .
Caption: E. coli bacteria. Credit: NIH