Hungry Black Holes
Nearby galaxy clusters CL 0542-4100 and CL 0848.6+4453 imaged by the Chandra X-ray Observatory. Low energy X-rays are in red, intermediate energy in green, and high energy in blue. A study in the July 20 issue of Astrophysical Journal Letters indicates that Black Holes in older clusters are 20 times more active than those in younger clusters. The early Universe was dominated by energetic quasars and Active Galactic Nuclei (AGN). As they matured and their fuel was used up, these objects evolved into galaxies like our Milky Way.
The Big Bang created billions upon billion of Black Holes. Because the speed of light was higher, primordial Black Holes formed in a variety of sizes. The big ones formed the seeds of clusters and galaxies. Our galaxy formed around a Black Hole like the whirlpool around a drain. Supermassive Black Holes don't die, they just fade away.
Tiny Black Holes could exist within planets, even Earth. This one is too tiny to suck us up, but the tiny amount it does eat keeps Earth's core warm. This heat causes earthquakes, volcanoes and the formation of islands. The Black Hole also powers the magnetic field that protects us from the radiation of space. Our planet and life would not exist if not for a Black Hole.
Speaking of hunger, the Monterey Bay region has been invaded by 2-meter jumbo squid that munch on the local fish population. Previously jumbo squid were only found in warmer Pacific waters. Their appearance near the Central California coast may be a result of Earth's changing climate. Earlier this month in Tasmania, a rare giant squid measuring 8 metres washed ashore near the town of Strahan. When Earth's climate changes the species adapt, a squid pro quo.