Related topics: dark matter

The mass of the universe

Bochum cosmologists headed by Professor Hendrik Hildebrandt have gained new insights into the density and structure of matter in the universe. Several years ago, Hildebrandt had already been involved in a research consortium ...

Astronomers search for gravitational-wave memory

Astronomers regularly observe gravitational waves (GW)—ripples in space and time—that are caused by pairs of black holes merging into one. Einstein's theory of gravity predicts that GW, which squeeze and stretch space ...

Physics: Not everything is where it seems to be

Scientists at TU Wien, the University of Innsbruck and the ÖAW have for the first time demonstrated a wave effect that can lead to measurement errors in the optical position estimation of objects. The work now published ...

Dense stellar clusters may foster black hole megamergers

When LIGO's twin detectors first picked up faint wobbles in their respective, identical mirrors, the signal didn't just provide first direct detection of gravitational waves—it also confirmed the existence of stellar binary ...

How to get rid of a satellite after its retirement

Researchers at University of La Rioja (Spain) have developed a new method to eliminate artificial satellites in highly elliptical orbits when they finish their missions. The methodology, which reduces both cost and risk, ...

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