NASA found something shooting beams deep into the Milky Way. The heart of our galaxy has long been regarded as a quiet, inscrutable void—a cosmic backwater amid celestial fireworks. But recent observations have flipped that notion on its head, placing Sagittarius A*, the Milky Way’s supermassive black hole, into the spotlight. Using the James Webb Space Telescope’s infrared gaze, astronomers have uncovered a restless cacophony: a flaring accretion disk that pulses with unpredictable bursts of light.
NASA zeroes in on the hidden engine powering a light show in our galaxy’s core
This isn’t your average cosmic background noise. Instead of sporadic outbursts, the flares have the most various types—ranging from faint flickers that last just seconds to brilliant eruptions that blaze for hours, even days. They’re happening constantly, with as many as five to six major flares each day, interspersed with numerous smaller ones.
What’s driving this chaotic light show? Researchers suspect two distinct mechanisms: small-scale turbulence stirring faint flickers, and powerful magnetic reconnection events—akin to solar flares—that unleash vivid bursts of radiation. The kind of layered, dynamic behavior that suggests there’s much more to uncover—and now NASA is closing in on the source of that mysterious energy surge in the heart of the Milky Way
The beacon in the black hole: the only thing that escapes from these cosmic destroyers
Scientists have been trying to understand the power of black holes since they were first theorized in the 18th century. What actually happens in the disk of matter spinning around them is still unclear. Recently, while monitoring Sagittarius A — the supermassive black hole at the center of the Milky Way — researchers caught it doing something unusual.
Black holes cannot be seen directly. NASA usually detect them by how they warp space-time. But in this case, Sagittarius A has been putting on a show. Throughout 2023 and 2024, telescopes picked up flashes of light coming from the dust and gas around it.
Small flickers aren’t rare — they’re often caused by minor shifts in the disk. The brighter flares, however, point to more violent changes. In these moments, powerful magnetic fields collide in a dense, high-pressure zone, accelerating particles to nearly the speed of light. That collision sends out bursts of radiation, visible in both infrared and X-ray wavelengths.
Close enough to study: closer, and it would be hazardous for Earth
Farhad Yusef-Zadeh, a physics and astronomy professor at Northwestern University, led the team that tracked these changes with NASA’s James Webb Space Telescope. Using its near-infrared camera, they watched Sagittarius A for hours at a time over the course of a year.
The disk near the “point of no return” — the event horizon, where nothing escapes — is packed with gas, plasma, and dust locked into the black hole’s grip. Unlike Saturn’s rings, which orbit in relative safety, this material is on a one-way path toward the darkness, beyond even the reach of light. One reason NASA can capture such detail is that Sagittarius A is only about 26,000 light-years from Earth — practically next door in galactic scale.
Putting Einstein to the test: a black hole causing a large distortion in space-time
These bursts of light give NASA a rare chance to test century-old physics. Albert Einstein’s special relativity, introduced in 1905, explained how space and time are linked: time passes differently for moving objects, fast-moving objects appear shorter, and nothing can outpace light. A decade later, his general theory of relativity reframed gravity as the bending of space-time. Massive objects — planets, stars, or black holes — distort their surroundings, and that warping is what we experience as gravity. Before that, another theoretical force in the universe was believed to be present.