New space dangers found by NASA in astronaut blood

A study found alarming changes in the bodies of astronauts aboard the International Space Station.

Credit: NASA
  • A NASA study reveals new dangers to the human body in space.
  • The absence of gravity caused changes in people's blood flows.
  • Some had blood going in reverse while others developed clots.
Keep reading Show less

Neil deGrasse Tyson: Want to prove aliens exist? Do this.

Neil deGrasse Tyson wants to believe. He just needs to see the evidence first.

  • Are UFOs actually alien spacecraft visiting Earth? They might be, says Neil deGrasse Tyson, but if you want to make that claim you better bring the evidence to support it.
  • Eyewitness testimony is the lowest form of evidence. To measure what is true or not true in the world, we require data -- and when it comes to alien appearances, it's as astronomer Carl Sagan said: "Extraordinary claims require extraordinary evidence."
  • So what can you do to prove your alien abduction story? Take selfies, live-stream video to the internet, and if you happen to find yourself in a spacecraft getting your "gonads poked", then grab an item from the alien lab as evidence before they release you back on Earth. Neil deGrasse Tyson wants to believe, but not until he sees the data.
Keep reading Show less

WATCH: Dinosaurs traveled other parts of Milky Way than humans

Dinosaurs never left Earth, but they still traveled millions of miles through the Milky Way galaxy.

Dr. Jessie Christiansen
  • A new video shows how life has evolved on Earth during the planet's most recent revolution around the Milky Way, also known as one galactic year.
  • A galactic year is about 220 million years, and it was the beginning of the Jurassic period the last time Earth was at this point in its revolution.
  • How will Earth look on its next galactic birthday? It's impossible to know for sure, but a few events seem inevitable.
Keep reading Show less

After 42 years in space, Voyager 2 breaks thru the heliosphere

A historic NASA probe sends back a treasure-trove of information from billions of miles away.

  • NASA's Voyager 2 probe sends back invaluable information about interstellar space.
  • The probe was launched in 1977.
  • 5 new studies detail the data gathered by its instruments.
Keep reading Show less

‘Cosmological crisis’: The universe may be a closed sphere, not flat

A new paper claims that scientists might be wildly mistaken about the density — and therefore, the shape — of our universe.

NASA
  • Scientists have long considered the universe to be flat like a sheet of paper.
  • In a recent paper, a team of researchers argued that data from the Planck telescope suggests the universe is closed.
  • Still, this claim is far from proven, and some scientists have said the likely explanation is that the data is a statistical fluke.
Keep reading Show less