流星为什么会发光发热？Have you ever seen meteors (流星)? They are rocks that fall to Earth from space. They burn brightly when they enter our atmosphere (大气层). We also call them falling stars. But why do ……

to destroy lots of life might strike Earth once every 500,000 years.Sounds pretty rare — but if one did fall.... Do we really want fleets of nuclear weapons sitting around on Earth? "The world has less to fear ……

built by lunar bricks was made on Earth.C. They will be tested in China’s space station.C... stronger building materials on Earth2. How do the mortise and tenon joint structures help with lunar ……

the comets (彗星) and asteroids (小行星) that fly around our solar system. Most of these space rocks burn... of rain you’re thinking of.Every year, about 5,200 tons of dust (灰尘) fall to Earth from space ……

Rocks in space can rain dust on Earth.  QIANTURocks in space can rain dust on Earth.  ... fall to Earth from space, according to a recent study. Scientists found this by going to Antarctica ……

will fall into the Pacific Ocean.B. It will be brought back to Earth.C. It will be left in outer space... will fall into the Pacific Ocean.B. It will be brought back to Earth.C. It will be left in outer ……

Search for space lakes (P6)Search for space lakes (P6)Choose the answer:Choose the answer:1. What do we know about JUICE?1. What do we know about JUICE?A. It will collect data from Jupiter and its ……

. It will be brought back to Earth.C. It will be left in outer space forever.D. It will soon burn up in space. ... to Earth.C. It will be left in outer space forever.D. It will soon burn up in space. 5. From ……

meteorites?2. Which of the following is TRUE about meteorites?A. They are rocks on Earth. A. They are rocks on Earth. B. They can burn up things near them.B. They can burn up things near them.C ……

conditions.B. Why Chinese children love junk food.C. What Chinese students do during their breaks.D... people’s health conditions.B. Why Chinese children love junk food.C. What Chinese students do ……

) took its first photos of the sun. It used China’s first solar space telescope (空间太阳望远镜) to do... of the sun. It used China’s first solar space telescope (空间太阳望远镜) to do the job. The pictures ……

will happen when the space lab falls back to Earth. Will it do any harm? Tiangong I has been...天宫一号的坠落会对地球造成伤害吗？Do you know about Tiangong I? It is China’s first space lab. It was launched ……

to be the longest day of the year. Remember to take a walk outside on this day. Do you feel like there're more... was dark and cold, and itsgravity(重力) made it fall together.The gas that collected at the centre got hot ……

on the moon with the Apollo space mission (任务). Apollo 11 carried three astronauts to space. Neil Armstrong... with the Apollo space mission (任务). Apollo 11 carried three astronauts to space. Neil Armstrong became ……

. They are flying rocks in space. Earth’s gravity (重力) catches them and lets them fall. Most of them burn... at night. They are flying rocks in space. Earth’s gravity (重力) catches them and lets them fall. Most ……