Astronomers have made a groundbreaking discovery: a swarm of over 100 stellar-mass black holes is traversing through the Milky Way within the star cluster known as Palomar 5. This extraordinary cluster,

In any globular cluster, all its stars formed at the same time, from the same cloud of gas. The Milky Way has around 150 known globular clusters; these objects are excellent tools for studying, for example, the history of the Universe, or the dark matter content of the galaxies they orbit.

An artist's illustration of the longest black hole jet system ever observed. Nicknamed Porphyrion after a mythological Greek giant, these jets span roughly 7 megaparsecs, or 23 million light- years. That is equivalent to lining up 140 Milky Way galaxies back-to-back. Credit: E. Wernquist / D. Nelson (IllustrisTNG Collaboration) / M. Oei

The energetic streams are together 23 million light-years in length—roughly as long as 140 Milky Way galaxies lined end to end

Black hole jets equivalent to 140 Milky Way galaxies discovered coming from far-away galaxyCalTech With only 117 in MLB history, an immaculate inning is rarer than a no-hitter. What to expect during perimenopause, including lesser-known symptoms and how long this phase lasts.

Black holes hold some of the universe’s greatest mysteries, with giant empty spots in space sucking in whatever enters their gravitational pull. However, the mystery is now growing as astronomers are now saying there could be a swarm of black holes moving across the Milky Way.