explore the mission that landed on this asteroid after orbiting it for a year. photo courtesy nasa scientists classify asteroids by their composition. c-type or chondrite asteroids are the most common type. they likely consist of clay and silicate rocks. s-type or "stony" asteroids consist of ...
Through his observation that comet tails were blown around by some kind of solar breeze, he believed sails could capture that wind to propel spacecraft the way winds moved ships on the oceans. While Kepler's idea of a solar wind has been disproven, scientists have since discovered that ...
I can take you back all the way to the beginning when I think this great interest in asteroids started at NASA and on Earth. And that’s way back in 1994: A comet named Shoemaker-Levy impacted Jupiter, and we had about a year’s notice of this. All of the astronome...
Instead of using chemicals to create the links between the DNA and proteins, the project researchers developed a method using laser pulses that generate pulses as short as a femtosecond—equivalent to one millionth of one billionth of a second. By directing these pulses at living cells, it becom...
She developed the Harvard spectral system, which is used to classify stars today. Before Cannon, stars were classified alphabetically, from A to Q, based on their temperatures. Cannon realized that a star's elements create different wavelength and determine its color. In 1901, she had improved ...
Annie Jump Cannon(1863–1941), who became known as the "census taker of the sky", was an American astronomer who classified around 350,000 stars manually. She developed theHarvard spectral system, which is used to classify stars today. ...
but the Geminids are unique in that they originate from an asteroid. NASA astronomers believe that the mysterious asteroid 3200 Phaethon, discovered on October 11, 1983, may be a "dead comet" or "rock comet" — scientists are not entirely sure how to classify it due to its comet-like orb...
Ben:Yeah. Your word. But in many cases, you're not voicing it aloud. So, you're not creating sound vibrations. So, how would you classify something like TM as sound medicine? Kulreet:So, that's such a great question because we tend to think about sound as something audible, but whe...
Another sensitive subject is the question of who is responsible if something goes wrong. "Takeautonomous robots. Automatic weapons (so-called killer robots) that can decide whether to classify someone or something as hostile without referring back are already being designed. People are not needed wh...
adenomyomatosis (ADM) in the sessile type. For GPLs that are difficult to classify, it is recommended to check for polyp shape change due to postural changes. In addition, contrast-enhanced US (CEUS) can accurately diagnose pedunculated lesions, which showed a sessile shape on the conventional...