Evidence has mounted that most galaxies harbor enormous black holes at their centers. Most of these, like the Milky Way's, are relatively quiet. But a few end up swallowing prodigious amounts of matter from their surroundings and blast out staggering amounts of energy, turning these active galactic nuclei into some of the brightest objects in space. What explains the difference? A popular idea was that galaxy mergers could disrupt a galaxy's internal structure, sending copious amounts of gas spiraling inwards. But a new survey of active galactic nuclei suggests that this model may need some serious revision.
The supermassive black hole is 40 million times as massive as the sun and powers a quasar that existed 700 million years after the Big Bang.
Vision Pro is here and it’s a surprisingly capable device. Apple has also loaded the headset with a ton of options and features that aren’t obvious at first glance.
Engineers expect to lose contact with the private US moon lander Odysseus on Tuesday, cutting short the mission after its sideways touchdown last week.
