A study found alarming changes in the bodies of astronauts aboard the International Space Station.
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.
Dinosaurs never left Earth, but they still traveled millions of miles through the Milky Way galaxy.
- 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.
A historic NASA probe sends back a treasure-trove of information from billions of miles away.
A new paper claims that scientists might be wildly mistaken about the density — and therefore, the shape — of our universe.
- 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.