In 1915, Albert Einstein figured out the answer when he published his theory of general relativity. The reason gravity pulls you toward the ground is that all objects with mass, like our Earth, actually bend and curve the fabric of the universe, called spacetime. That curvature is what you ...
Artificial satellites, for example, also are "continually falling" and in many instances that effect is not negligible. They usually need boosting or end up falling back to Earth after a few months/ years/ decades. Planets are MANY orders of magnitude heavier, so it's not as easy to slow...
Why do astronomers hypothesize that a massive black hole lies at the center of 'M87'? What are the significant differences between the life and eventual fate of a massive star and an average-sized star such as the Sun? Why do weathe...
Answer to: When airplanes take off, why don't they become satellites and permanently circle the Earth? By signing up, you'll get thousands of...
The U.S. needs to detect and prevent a hostile nation or terrorist group from deploying space-based weapons or attacking its navigational, communications and surveillance satellites. And while it and other major powers such asRussiaand China are signatories of a 1967 treaty that forbids nations fr...
To take a single aspect of global change monitoring that feeds into IPCC reporting, we can point to the value of Earth-observing satellites observing the effects of climate change from space. Satellites can see the impact of wildfires, melting ice, seasonal warming or shifting, increasing floods...
Our science has overcome once insurmountable threats; for example, with the help of weather satellites, we can predict sudden changes in the weather and take precautions. Advanced agricultural technology can reduce the impact of drought or cold on crop yields. However, along with scientific progress...
Do geomagnetic storms affect humans? A geomagneticstorm does not pose much threat to humans, but it can affect satellites orbiting Earth and GPS, It also can cause disruptions to some radio communications, according to NASA. The storm was rated a "G2" on the NOAA's five-level storm scale...
Putting so many satellites into orbit raises a number of potential concerns, including the proliferation of "space junk." While SpaceX's Starlink satellites are designed to fall out of orbit and burn up in Earth's atmosphere over time, the presence of so many spacecraft in orbit at once in...
a他用六颗卫星覆盖地球 He uses six satellites to cover Earth [translate] a他离开反而造成麻烦 He leaves instead creates the trouble [translate] a因为你阴阳不平衡,所以你应该吃一些阳的食物 Because your masculine and feminine elements is not balanced, therefore you should eat some positive foods [...