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Astronomers Discover a Strange Galaxy Without Dark Matter

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Ramin Skibba

Science
01.07.2022 07:00 AM

Astronomers Discover a Strange Galaxy Without Dark Matter

New, high-resolution observations of a faint, fluffy galaxy suggest
that dark matter's not as ubiquitous as scientists thought.

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dark matter
Astronomers mapped out the stars (shown here in blue) and gas (green)
of the strange galaxy known as AGC 114905.Photograph: Javier Roman &
Pavel Mancera Pina

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Three years ago, Filippo Fraternali and his colleagues spotted a half
dozen mysteriously diffuse galaxies, which looked like sprawling
cities of stars and gas. But unlike almost every other galaxy ever
seen--including our own Milky Way--they didn't seem to be enshrouded in
huge masses of dark matter, which would normally hold those stellar
metropolises together with their gravity. The scientists picked one
to zoom in on, a modest-sized galaxy about 250,000,000 light-years
away, and they pointed the 27 radio telescope antennas of the Very
Large Array in New Mexico at it.

Topicsdark mattergalaxiesAstronomytelescopesspaceGravity
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