19.
On April 24,1990,the world of science reached a new milestone (里程碑).The US Space Agency launched(发射)Hubble Space Telescope (哈伯太空望远镜) into space.It then began its exploration(探险) of the universe (宇宙).So how has it developed science?Let's take a closer look at Hubble to celebrate its 25th birthday!
Hubble is the first large telescope to be sent to space.Its job is to orbit (绕轨道而行) Earth and take a lot of pictures of the universe.It is 13.2meters in length and weighs 11,110kilogram.
It works differently to your school telescope,which helps you see an object larger and clearer.Hubble works by collecting light.The bigger the mirror,the more light it can collect.Its main mirror is 2.4meters.How good is its view?Scientists says that it's like seeing a pair of fireflies (萤火虫) in Tokyo from a home on the east coast of the US.
Hubble's discoveries have led to some major breakthroughs(突破).It proved(证实) that the universe was actually speeding up,not slowing down.It discovered black holes (黑洞).Also,with the help of Hubble,scientists have a more exact answer of the age of the universe:13.7billion.
So how long will Hubble work for us?People are not sure.But when Hubble's days of exploration come to an end,its discoveries will still stay with us.Its successor (继任者),the Webb Space Telescope,is being put together as we speak.With a much more powerful telescope,we can only wait to be in awe of(敬畏) its future discoveries.
35.Which of the following about the Hubble Space Telescope is NOT true?D
A.It began to explore the universe in 1990.
B.It's the first large telescope to be sent to space.
C.It orbits Earth and takes pictures of the universe.
D.It has stopped working because it's too old.
36.From Paragraph 3,we learn thatB.
A.Hubble works similar to school telescopes
B.light is important for Hubble to work
C.it's better to use a smaller mirror for Hubble
D.Hubble can see fireflies on Earth in space
37.After years of work,Hubble found out thatC.
A.the Earth is round
B.the universe was slowing down
C.there are black holes in the universe
D.the universe will disappear in 13.7billion years
38.The article mainly talks aboutC.
A.NASA
B.school telescopes
C.the Hubble Space Telescope
D.the Webb Space Telescope.