Experimental physicist Prof. Thomas Zentgraf and his two colleagues from the University of Birmingham, Dr. Guixin Li and Prof. Shuang Zhang, have for the first time proved experimentally the nonlinear rotational Doppler effect ...
General Physics
Mar 24, 2016
5
287
A team of physicists at the Technical University of Denmark has found the reason a spinning magnet can cause a secondary magnet to levitate without the need for stabilization. In their paper published in the journal Physical ...
While those wonderful light sabers in the Star Wars films remain the figment of George Lucas' fertile imagination, light mills - rotary motors driven by light - that can power objects thousands of times greater in size are ...
General Physics
Jul 5, 2010
8
2
On Oct. 5, 2020, the rapidly rotating corpse of a long-dead star about 30,000 light years from Earth changed speeds. In a cosmic instant, its spinning slowed. And a few days later, it abruptly started emitting radio waves.
Astronomy
Jan 27, 2023
27
496
It is tempting to believe that effects arising from Einstein’s theory of relativity, where objects move at speeds close to the speed of light, arise mainly at very large length scales, for example the movement of planets ...
General Physics
Aug 10, 2012
4
0
Peering deep into the infancy of the universe, the European Southern Observatory's Very Large Telescope (VLT) recently confirmed the discovery of the brightest and fastest growing quasar. Quasars are luminous objects in the ...
Astronomy
Feb 28, 2024
0
64
You may not realize it, but the Doppler effect is everywhere in our lives, from tracking the speed of cars with radar to locating satellites in the sky. It's all about how waves change their frequency when a source (like ...
Optics & Photonics
Oct 20, 2023
0
321
Astronomers have used the National Science Foundation's Karl G. Jansky Very Large Array (VLA) and NASA's Spitzer Space Telescope to make the first measurement of wind speed on a brown dwarf—an object intermediate in mass ...
Astronomy
Apr 9, 2020
3
1177
There are two main approaches that humanity can take to living in space. The one more commonly portrayed is colonizing other celestial bodies such as the moon and Mars. That approach comes with some major disadvantages, including ...
Space Exploration
Sep 21, 2020
3
315
One of the most intriguing predictions of Einstein's general theory of relativity is the existence of black holes: astronomical objects with gravitational fields so strong that not even light can escape them.
Astronomy
Feb 9, 2023
90
115
