When the European Space Agency's Rosetta spacecraft discovered abundant molecular oxygen bursting from comet 67P/Churyumov-Gerasimenko (67P) in 2015, it puzzled scientists. They had never seen a comet emit oxygen, let alone ...
Astronomy
Mar 14, 2022
8
689
Though a doomed star exploded some 20,000 years ago, its tattered remnants continue racing into space at breakneck speeds—and NASA's Hubble Space Telescope has caught the action.
Astronomy
Sep 28, 2023
1
2498
Each of our cells is surrounded by a complex membrane that functions as a biological border, letting ions and nutrients such as salt, potassium and sugar in and out. The guards are membrane proteins, which do the hard work ...
Materials Science
May 12, 2020
10
406
(Phys.org) —North Carolina State University researchers have identified a new mechanism to convert natural gas into energy up to 70 times faster, while effectively capturing the greenhouse gas carbon dioxide (CO2).
Materials Science
May 7, 2013
10
0
(PhysOrg.com) -- After several hours of exposure to sunlight, silicon solar cells experience light-induced degradation, which can decrease their efficiency by up to 10%. In a new study, scientists have attempted to detect ...
In the photoelectric effect, a photon ejects an electron from a material. Researchers at ETH have now used attosecond laser pulses to measure the time evolution of this effect in molecules. From their results they can deduce ...
Optics & Photonics
Jun 22, 2018
1
917
The high cost of platinum catalysts used in hydrogen fuel cells limits the commercialization of fuel cell electric vehicles. Scientists are studying alternative catalysts to increase cost-effectiveness and maintain efficiency ...
Materials Science
May 21, 2020
1
1914
Astronomers have long held that water—two hydrogen atoms and an oxygen atom—was a relative latecomer to the universe. They believed that any element heavier than helium had to have been formed in the cores of stars and ...
Astronomy
May 13, 2015
4
178
The core–mantle boundary (CMB) is the interface between the Earth's iron metal core and the thick rocky layer of mantle just above the core. It is a world of extremes—temperatures thousands of degrees Fahrenheit and pressures ...
Earth Sciences
Nov 17, 2023
0
300
Why is the sun's outermost layer 1,000 times hotter than the visible surface of the sun? What are the physical mechanisms that allow oxygen atoms in Earth's atmosphere to overcome gravity and race into Earth's protective ...
Space Exploration
May 5, 2016
0
13
