James Webb Space Telescope spies massive shockwave and baby dwarf galaxy

Shockwaves created by a collision between the galaxies of Stephan’s Quintet and an intruder galaxy are driving strange processes in the intergalactic medium, the tenuous clouds of warm-to-hot hydrogen plasma that exist in the space between galaxies.

New observations made with the James Webb Space Telescope (Webb or JWST) and the Atacama Large Millimeter/submillimeter Array (ALMA) provided astronomers with a good view of intruder galaxy NGC 7318b as it violently forces its way into this group of galaxies at a relative speed of around 1.8 million mph (approximately 800 kilometers per second). That’s fast enough to travel from Earth to the moon and back again in just over 15 minutes.