The omicron variant of SARS-CoV-2 may be less efficient at infiltrating the lungs and spreading from cell to cell, early lab studies suggest.
Some stars don't have planets orbiting them. Here's why.
An international partnership of space agencies just launched JWST, the biggest, most powerful space telescope ever made, in an achievement that was decades in the making.
The $10 billion Webb is considerably bigger and more complex than the Hubble Space Telescope, and it will be going much farther afield as well.