By Measuring Light From Individual Stars Between Galaxy Clusters, Astronomers Find Clues About Dark Matter

Astronomers have been able to measure an extremely faint glow of light within galaxy clusters, and that measurement came with a surprise: it traced the amount of invisible dark matter, something that scientists have been trying to pin down for decades.

Continue reading “By Measuring Light From Individual Stars Between Galaxy Clusters, Astronomers Find Clues About Dark Matter”

Physicists Figure out how to Make Gravitational Wave Detectors “Hear” 6x More Universe

Gravitational wave detectors are limited by fundamental quantum noise – an incessant “hum” that they cannot ever remove. But now physicists have recently improved a technique, called “squeezing”, that can allow the next generation of detectors to double their sensitivity.

Continue reading “Physicists Figure out how to Make Gravitational Wave Detectors “Hear” 6x More Universe”

Astronomers are Starting to Understand the Quasar Lifecycle

Supermassive black holes have a complicated lifecycle. Sometimes they’re “on”, blasting out tremendous amounts of energy, and sometimes they’re “off’, where they sleep like dragons in their caves. By comparing the proportion of high-energy to low-energy waves emitted by quasars, astronomers are beginning to pin down how many black holes are sleeping, and when they’re likely to wake back up.

Continue reading “Astronomers are Starting to Understand the Quasar Lifecycle”