The rockets take astronauts and man-made satellites into space. The satellites are used for communication weather monitoring and research. But how do satellites stay up without falling down? There are two opposite forces (力量) acting on the satellite. One of them is the force of gravitation (...
Many people dream of traveling into outer space. However, spending too much time in space may cause health problems, according to NASA. Muscle and bone loss In a weightless environment, astronauts (宇航员) don’t need to use their muscles to support themselves, so the muscles start shrinking...
astronauts and 50 astronauts from other countries. The training process used today is the culmination of this considerable experience. The first phase starts with two years of basic training. Much of this training takes place in the classroom, where astronaut candidates learn about vehicle and space...
66.A.细节题,结合最后Many people think their lives are very interesting and their dream jobs are to be the astronauts.可知是有趣的,故选A.67.D.标题判断题.结合第一段Life in space is much different from life on earth.How do astronauts live in space?是介绍宇航员的生活,故选D. 本文是介绍...
He notes that the extreme environment in space forces engineers to be creative. Lack of gravity in outer space poses significant challenges when performing everyday tasks. An astronaut's work is not restricted to when he or she is in space, according to NASA. "When astrona...
题目The rockets take astronauts and man-made satellites(卫星)into space. The satellites are used for communication, weather checking and research.But how do satellites stay up without falling down? There are two opposite forces influencing the satellite. One of them is the ...
Astronauts conduct experiments and improve our knowledge of cultivating plants in space, as well as many other critical arenas of science. Earth-bound researchers and scientists analyze the results and conduct their own experiments, thinking up new theories and possible solutions to test. Before we ...
. It's morphed to more than that now, but the curiosity and the search for wonders are both still there as driving forces. Whether we'reactuallyout there or not, the "exploration" of space gives us the opportunity to look back at ourselves and hopefully be improved by the experience....
The crews of these spacecraft would experience huge forces of acceleration (G-forces), even more than the G-forces experienced by jet fighter pilots when they accelerate and maneuver their aircraft. To compensate for this, Star Trek writers came up with the idea of inertial dampers, which ...
How big are the forces on a rollercoaster?We measure forces by comparing them to the force of gravity, or g. You're currently feeling a force of about 1g, sitting in a chair. A force twice as big as the force of gravity is 2g, four times as big is 4g, and so on. The biggest...