How old is California’s Yosemite Valley?

The iconic, glacier-carved features of Yosemite Valley appeared sometime during the past 50 million years, when Sierra Nevada granite was first exposed, but geologists have not been able to establish exactly when the valley as we know it today appeared…

Unprecedented glimpse of merging galaxies

Using the James Webb Space Telescope to look back in time at the early universe, astronomers discovered a surprise: a cluster of galaxies merging together around a rare red quasar within a massive black hole. The findings offer an unprecedented opportu…