【太空营第五课预习】NASA GLASTcast Episode 2 What are Gamma Rays_360p KGC国际游学 12 播放 · 0 弹幕 07:36 【天文营第四课预习】 Nasa Now black hole KGC国际游学 9 播放 · 0 弹幕 03:10 【太空营第二课预习】Real World Small Bodies Orbiting the Sun_360p KGC国际游学 4 播放 · 0...
Some might find it ironic that an organization like NASA, who studies our atmosphere, is Ok with rockets polluting it so much. Or isn’t it weird that Elon Musk, the same person who is pushing sustainable energy with Tesla, also has a rocket company that runs on fossil fuels? And let’...
What changes did NASA make to the Apollo spacecraft? How did they photograph the moon landing? Who built the Saturn rocket? How many tons was the payload of the Saturn rocket? How much does a space shuttle launch cost? How did the moon landing break barriers?
"How gold, orange, or red the moon appears during a total lunar eclipse depends on how much dust, water, and other particles are in Earth's atmosphere"according to NASA scientists. Other atmospheric factors such as temperature and humidity also affect the moon's appearance during a lunar ecli...
The acceleration is a measure of how much the ball's speed changes in a certain time. Less obviously, it's also a measure of how much force you apply to every kilogram of mass that the object contains. Photo by RJ Stratchko courtesy of US Navy and Wikimedia Commons....
NASA's goal is to reduce launch cost to only a few hundred dollars per pound within the next 25 years. They believe one way to do that is to dump the more than a million pounds of liquid oxidizer that is currently needed for combustion. "Air-breathing rocket engine technologies have the...
Even though the action and reaction of the rocket motor during burn is equal, the mass of the fire, gas, and smoke being propelled by the rocket engine is much smaller or less than the overall mass of the rocket being sent in the opposite direction. As a result, even though the force...
Photo courtesy NASA In its nearly 30-year history, the space shuttle program has seen exhilarating highs and devastating lows. The fleet has taken astronauts on dozens of successful missions, resulting in immeasurable scientific gains. But this success has had a serious cost. In 1986, the ...
Concerning transfers to Mars, these are by necessity interplanetary transfers, i.e., orbits that have the sun as central body. Otherwise, much of what was said above applies: the issue remains the expense of energy. An additional complication lies in the fact that the Mars orbit is quite ec...
Even rain is a problem, because it decreases visibility and damages the balloon material (of course, it's not much fun to fly around in wet weather anyway). And while you need a nice wind current to have a good flight, very strong winds could easily wreck the balloon. Pilots also call...