NASA's James Webb Space Telescope launched to space on Christmas Day, a major milestone for a telescope that promises to change scientists' understanding of the history of our universe.
Why it matters: The telescope, known as the Hubble Space Telescope's successor, is designed to capture the light of some of the first galaxies that formed after the Big Bang, parse out the atmospheres of planets in other solar systems, watch stars evolve in clouds of dust and other tasks.
Why it matters: The JWST is designed to capture the light of some of the first galaxies that coalesced after the Big Bang, learn more about how stars form, peer into the atmospheres of alien planets and more.
The CDC on Thursday shortened the recommended isolation time for health care workers who test positive for COVID-19 from 10 days to seven days if they're asymptomatic.
Driving the news: The new guidance follows calls by health officials for the CDC to shorten its recommendation on isolation for fully vaccinated people who test positive due to concerns about the Omicron variant.
