Russia claims to have used its Kinzhal hypersonic missiles for the first time, in its invasion of Ukraine. Here's why these super-fast weapons are so concerning.

  By WG  Mar 22, 2022

Here's why NASA has different radiation limits for male and female astronauts, and how these limits may change in the near future.

  By WG  Mar 22, 2022

Three cosmonauts donned Ukraine-flag colors when boarding the space station, but now the Russians say the fashion choice had nothing to do with support for Ukraine.

  By WG  Mar 22, 2022

Polar bears evolved during a time when the North and South poles were not connected by ice or land, so they stayed at the North Pole.

  By WG  Mar 22, 2022