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A mysterious cosmic signal radiating from the center of our Milky Way galaxy is actually triggered by ancient stars, rather than dark matter, according to a new study.
There is a mysterious abundance of high-energy gamma-rays at the Milky Way's core, also known as the galactic bulge. Previous studies suggested that this abundance originated from dark matter — the mysteriously invisible substance that does not emit light or energy, yet is thought to make up most of the matter in the universe.
March - NASA - Satellites - Mission - Phenomenon
On March 12, 2015, NASA launched four satellites on a mission to study a weird phenomenon in Earth's magnetic field called magnetic reconnection. When Earth gets bombarded with plasma from the sun, our planet's magnetic field lines can break apart and reconnect. This releases huge bursts of energy in Earth's magnetic environment and can funnel charged particles into the atmosphere, creating pretty auroras. But exactly how and why magnetic reconnection happens is a bit of a mystery. To figure out exactly what's going on, NASA launched the Magnetospheric Multiscale Mission. The mission's four identical spacecraft fly in a pyramid shape called a tetrahedral formation, which allows the mission to observe these reconnection events in three dimensions. One year since the mission launched, it made the first direct detection of magnetic reconnection.
"At the distance to the center of our galaxy, the emission from many thousands of these whirling, dense stars could be blending together to imitate the smoothly distributed signal we expect from dark matter," Roland Crocker, co-author of the study and a researcher from the ANU Research School of Astronomy...
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