Discovered by Amateurs Some astronomers spend their entire careers looking for new discoveries in space，but a 10-year-old Canadian girl found one on her first try.In January，2011，Kathryn Gray，who often studied stars，was looking at recent pictures of outer space and comparing them to pictures taken years earlier.The pictures were just thousands of tiny spots of light，but Gray spotted a star that looked different in the recent pictures.Could it possibly be a supernova （超新星）？Usually a supernova is brighter，and it becomes visible through a telescope due to the brightness.Later Gray's discovery was confirmed，and she became the youngest person to discover a supernova.
    Throughout history，important discoveries in astronomy have been made by amateurs.An early example is William Herschel，who discovered Uranus in 1781.Uranus had been observed before，but expert astronomers thought it didn't belong to our solar system.When Herschel saw it with a telescope he had designed and built himself，he realized that it was orbiting the sun.This meant that Uranus was a planet.And so，the map of our night sky was changed forever.
    Then in 1930，a major discovery was made by a 24-year-old man，a farmer's son，with no college education or formal training in astronomy.Clyde Tombaugh had built a homemade telescope using instructions from an article in a boy's magazine.He used to draw detailed pictures of the surfaces of Mars and Jupiter.He sent the pictures to Dr.V.M.Slipher at the Lowell Observatory，who was so impressed and offered him a job on his team.Within a year，Tombaugh discovered a ninth planet，Pluto.It was regarded as a planet for 76 years，but scientists decided in 2006 that Pluto didn't meet all of the criteria for a true planet.It was then considered to be a dwarf planet.
    John Dobson is another influential amateur astronomer because he enabled so many others to take up astronomy as a hobby.In 1956，after constant attempts，he built a powerful telescope out of low-cost materials，such as paper tubes used in construction.With affordable tools like Dobson's telescope，more amateurs today have the technology that is needed to make discoveries of their own.

（1）How did Kathryn Gray discover the supernova？

Kathryn Gray discovered the supernova when she was comparing recent pictures of outer space to those taken years earlier.

Kathryn Gray discovered the supernova when she was comparing recent pictures of outer space to those taken years earlier.

（2）Why did Clyde Tombaugh get a job at the Lowell Observatory？

Clyde Tombaugh impressed Dr.V.M.Slipher with his pictures of the surfaces of Mars and Jupiter，so he was offered a job at the Lowell Observatory.

Clyde Tombaugh impressed Dr.V.M.Slipher with his pictures of the surfaces of Mars and Jupiter，so he was offered a job at the Lowell Observatory.

（3）Please decide which part is false in the following statement，then underline it and explain why.
The four amateur astronomers were all interested in astronomy and did some research，so they finally made discoveries of their own.

The four amateur astronomers were all interested in astronomy and did some research，so they finally made discoveries of their own.
According to the passage，not every amateur astronomer made a discovery although they were all astronomy hobbyists.

The four amateur astronomers were all interested in astronomy and did some research，so they finally made discoveries of their own.
According to the passage，not every amateur astronomer made a discovery although they were all astronomy hobbyists.

（4）Which of the amateur astronomers mentioned in the passage has impressed you most？Why？（about 40 words）

Kathryn Gray，the youngest person to discover a supernova，has impressed me most.Although she was young，she had her own hobby and devoted her time to jye.ai.It's the key to her success.That's why she has impressed me most.

Kathryn Gray，the youngest person to discover a supernova，has impressed me most.Although she was young，she had her own hobby and devoted her time to jye.ai.It's the key to her success.That's why she has impressed me most.