Occurring March 17, it was the biggest explosion in the 8-year history of NASA’s Lunar Impact Monitoring program that shoots continual video of the moon through 14-inch telescopes on Earth. NASA announced the event on May 17 after an analyst noticed the strike on a digital video. Scientists estimate the meteor weighed 88 pounds, was about 16 inches wide, and hit the moon at 56,000 miles per hour.
Steve Roy, Marshall Space Flight Center
An artist’s rendering of a small but powerful meteor strike on the moon.
In this Q&A Smithsonian Geophysicist Bruce Campbell, of the Air and Space Museum’s Center for Earth and Planetary Studies, answers a few questions about the explosion and the geologic processes that shape the moon’s surface. For years Campbell has been using radio telescopes to see through the moon’s thick layer of dust and debris and create a detailed radar map of the moon’s ancient bedrock topography.Q: Can the crater caused by this impact be seen from Earth?
Campbell: There is erosion on the moon which is coming from the exact process that caused this new crater. Think about it, that new 20-meter crater obliterated all the little craters that were in that spot before it. And it threw out dust that covered up and smoothed out other areas.
But even when fresh bedrock from beneath the dust is exposed by very large meteorite strikes, these new rocks are eventually broken down by the little bits of space dust zipping in and striking the moon day in and day out. In general, these tiny particles are traveling extremely fast. Most hit the ground at 2 kilometers per second or more. Even a particle of dust that’s moving at several kilometers per second will break a pretty good chunk off a rock on the ground.
Undetectable from Earth, these little particles are the dominant erosive effect on the moon…on a cosmic time scale these particles are just raining in. This crater is just part of that endless process of the soil gradually building up and rocks on the surface being broken down and craters being smoothed out. If you look at the pictures, the moon’s features are very rounded with gentle slopes; there are almost no sharp-edged hills on the moon.
Alison Mitchell | Newswise
Further Improvement of Qubit Lifetime for Quantum Computers
09.12.2016 | Forschungszentrum Jülich
Electron highway inside crystal
09.12.2016 | Julius-Maximilians-Universität Würzburg
Physicists of the University of Würzburg have made an astonishing discovery in a specific type of topological insulators. The effect is due to the structure of the materials used. The researchers have now published their work in the journal Science.
Topological insulators are currently the hot topic in physics according to the newspaper Neue Zürcher Zeitung. Only a few weeks ago, their importance was...
In recent years, lasers with ultrashort pulses (USP) down to the femtosecond range have become established on an industrial scale. They could advance some applications with the much-lauded “cold ablation” – if that meant they would then achieve more throughput. A new generation of process engineering that will address this issue in particular will be discussed at the “4th UKP Workshop – Ultrafast Laser Technology” in April 2017.
Even back in the 1990s, scientists were comparing materials processing with nanosecond, picosecond and femtosesecond pulses. The result was surprising:...
Have you ever wondered how you see the world? Vision is about photons of light, which are packets of energy, interacting with the atoms or molecules in what...
A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts in integrated optoelectronics, imaging, and photovoltaics.
Working with colleagues at Stanford and The Dow Chemical Company, researchers at the University of Illinois at Urbana-Champaign fabricated 3-D birefringent...
In experiments with magnetic atoms conducted at extremely low temperatures, scientists have demonstrated a unique phase of matter: The atoms form a new type of quantum liquid or quantum droplet state. These so called quantum droplets may preserve their form in absence of external confinement because of quantum effects. The joint team of experimental physicists from Innsbruck and theoretical physicists from Hannover report on their findings in the journal Physical Review X.
“Our Quantum droplets are in the gas phase but they still drop like a rock,” explains experimental physicist Francesca Ferlaino when talking about the...
16.11.2016 | Event News
01.11.2016 | Event News
14.10.2016 | Event News
09.12.2016 | Life Sciences
09.12.2016 | Ecology, The Environment and Conservation
09.12.2016 | Health and Medicine