may disappear by 2050.The burning ofcoal(煤), oil and gas makes the earth warmer. Scientists think...警惕！地球在"发烧"，需要紧急降温！APRIL 22 is World Earth Day. It's a day for everyone to care about the earth ……

greenhouse gases.People are burning more coal and oil today than they were 100 years ago.Greenhouse gases...以二氧化碳为主的温室气体是如何使地球变暖的呢？WHAT are greenhouse gases and how do they make Earth warmer?Greenhouse gases ……

, averaging about two hours of sleep less per night than on earth...RESEARCHERS think the human body clock could hinder space exploration.A team at the Imperial ……

them and go into space.This means the Earth gets hotter every year. It has got 1°F hotter over the last 100 years.So what's the problem?Many scientists think that the Earth is getting hotter than ……

percent more greenhouse gases than they should have done.A large rise in temperatures could be terrible for us and for many other living things on Earth. Sea levels will rise because higher temperatures ……

is enjoying a renaissance of popularity, keeping the fire of this daring art form burning brightly.... during the 1880s, many sought entertainment in the city's less respectable establishments ……

.The holes, about 20 and 30 times larger than Earth, are coronal (日冕的) holes. They appear as dark areas... than Earth, are coronal (日冕的) holes. They appear as dark areas in the sun since the “holes” are cooler ……

and space shuttles. They are in the rocket’s nose. It is much faster and more powerful (强有力的) than... from gunpowder (火药).Space shuttle航天飞机往返忙A space shuttle is used (被使用) more than once. It launches ……

and space shuttles. They are in the rocket’s nose. It is much faster and more powerful (强有力的) than... from gunpowder (火药).Space shuttle航天飞机往返忙A space shuttle is used (被使用) more than once. It launches ……

;.Meteorite (陨石): A meteor that hits Earth without burning up in the atmosphere.Meteorite (陨石):A meteor that hits Earth without burning up in the atmosphere.Meteor shower (流星雨): A collection of meteors ……

what happens to the garbage we create? Most of it is buried in landfills (垃圾填埋厂) or burned. Less than a quarter of our waste is recycled. A landfill is a carefully designed structure built ……

, elevators require far less energy and money than rockets, currently the main transportation to space. Also...In the movie, space elevators connect Earth and the space station.  CHINA FILM   ……

by-products of space research, called spin-offs, have improved the quality of life on earth in many ways.Some...THE research that went into developing the highly specialized technology for space travel has ……

超音速离心机将火箭发射到太空。超音速离心机将火箭发射到太空。Do spacecraft have to be sent to space by fuel-burning rockets? US... to Earth so it can be reused, the Daily Mail reported. Do spacecraft have to be sent to space ……

is “waking up”, commented Sky News.The holes, about 20 and 30 times larger than Earth, are coronal (日冕... speeds, even up to 800 kilometers per second.The holes, about 20 and 30 times larger than Earth ……