Category Astronomy/Space

Experimental results from the XENON1T dark matter detector limit the effective size of dark matter particles to 4.1X10-47 square centimeters–one-trillionth of one-trillionth of a centimeter squared–the most stringent limit yet determined for dark matter as established by the world’s most sensitive detector. Credit: XENON Collaboration

Analysis scours 276 days of data from world’s most sensitive detector. Experimental results from the XENON1T dark matter detector limit the effective size of dark matter particles to 4.1 x 10-47 square centimeters – one-trillionth of one-trillionth of a centimeter squared – the most stringent limit yet determined for dark matter as established by the world’s most sensitive detector.

The results, presented Monday in a seminar in Italy at the Gran Sasso Undergr...

Glowing brightly about 160,000 light-years away, the Tarantula Nebula is the most spectacular feature of the Large Magellanic Cloud, a satellite galaxy to our Milky Way. This image from VLT Survey Telescope at ESO’s Paranal Observatory in Chile shows the region and its rich surroundings in great detail. It reveals a cosmic landscape of star clusters, glowing gas clouds and the scattered remains of supernova explosions. Credit: ESO

Glowing brightly about 160,000 light-years away, the Tarantula Nebula is the most spectacular feature of the Large Magellanic Cloud, a satellite galaxy to our Milky Way. A new image reveals a cosmic landscape of star clusters, glowing gas clouds and the scattered remains of supernova explosions. This is the sharpest image ever of this entire field.

Taking advanta...

In a background magnetic field, represented by the cyan arrows, two electrons are propagating to the right, executing identical gyromotion. A circularly polarized electromagnetic wave approaches the upper electron from the left.
Credits: NASA

Encircling Earth are two enormous rings – Van Allen radiation belts – of highly energized ions and electrons. Various processes can accelerate these particles to relativistic speeds, which endanger spacecraft unlucky enough to enter these giant bands of damaging radiation. Scientists had previously identified certain factors that might cause particles in the belts to become highly energized, but they had not known which cause dominates.

Now, with new research from NASA’s Van Allen Probes and Time History of Events and Macroscale Interactions during Sub...

Illustration of emissions from a tidal disruption event shows in cross section what happens when the material from a disrupted star is devoured by a black hole. The material forms an accretion disk, which heats up and emits vast amounts of light and radiation. The emissions we are able to see from Earth depend on our viewing angle with respect to the orientation of the black hole. Credit: Illustration by Jane Lixin Dai

A star that wanders too close to the supermassive black hole in the center of its galaxy will be torn apart by the black hole’s gravity in a violent cataclysm called a tidal disruption event (TDE), producing a bright flare of radiation...