Scientists discover why fish evolved limbs and left water

Researchers find a key clue to the evolution of bony fish and tetrapods.

Credit: Karen Carr © The Field Museum
  • A new study says solar and lunar tide impacts led to the evolution of bony fish and tetrapods.
  • The scientists show that tides created tidal pools, stranding fish and forcing them to get out of the water.
  • The researchers ran computer simulations to get their results.
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3 mind-blowing space facts with Neil deGrasse Tyson

Tyson dives into the search for alien life, dark matter, and the physics of football.

  • Astrophysicist Neil deGrasse Tyson joins us to talk about one of our favorite subjects: space.
  • In the three-chaptered video, Tyson speaks about the search for alien life inside and outside of the Goldilocks Zone, why the term "dark matter" should really be called "dark gravity," and how the rotation of the Earth may have been the deciding factor in a football game.
  • These fascinating space facts, as well as others shared in Tyson's books, make it easier for everyone to grasp complex ideas that are literally out of this world.
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Astrophysicists discover exotic merger of black holes

Gravitational wave researchers observe black holes of different sizes colliding for the first time.

Simulation of two black holes of different size orbiting each other, while emitting gravitational waves. Blue colors are weaker gravitational radiation and red is stronger.
  • Gravitational wave researchers at LIGO and Virgo observatories spot black holes of different sizes colliding.
  • The finding is unusual because previous black hole mergers involved partners of similar size.
  • The new information re-confirms Einstein's theory of relativity.
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Long spaceflights change astronauts' brain structure, new study suggests

The changes in brain structure aren't the only bodily changes caused by zero gravity.

Photo by NASA via Getty Images
  • A new study finds that long term weightlessness can cause changes in brain structure, with an increase in white matter lasting a year after returning to Earth.
  • The researchers believe it to be caused by an increase in fluid pressure on the brain.
  • Potential solutions include creating artificial gravity.
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Scientist figures out how to move our sun to avoid space collisions

An astrophysicist proposes new designs for stellar engines that can move a solar system.

Credit: CapnHack, via energyphysics.wikispaces.com.
  • An astrophysicist proposes two new designs for stellar engines.
  • The engines would be able to move our sun and whole solar systems.
  • Moving the sun would be necessary to avoid collisions with supernovas and other space catastrophes.
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