A.when they were researching on the age of the universeB.when they attempted to test theories about the forming of stars and galaxiesC.to prove that the universe is continuously changingD.and showed that the stars and galaxies may have formed...
used 使用;discovered 发现; invented 发明。根据“Before compasses were...people told directions by looking at the sun, moon and stars."可知是指在指南针发明之前,人们通过看太阳、月亮和星星来辨别方向。故选C。 【18题详解】 句意:到了汉代,第一个指南针就是用这种特殊的石头制成的。 up 向上; in ...
When pulsars were first discovered, some of the astrophysicists involved briefly (i)___ these types of stars might be (ii)___ extraterrestrial intelligence. Specifically, the pulsar's periodic radiation pattern was initially interpreted as (iii)___ rather than—as it turned out to be—the...
Galaxies grow and evolve by merging with other galaxies, blending their billions of stars, triggering bursts of vigorous star formation, and often fueling their central supermassive black holes to produce luminousquasarsthat outshine the entire galaxy. Some of these mergers eventually go on to become...
Learn how these planets orbiting far away stars are observed by astronomers using methods such as Doppler shifts, transits, and microlensing. Related to this QuestionWhen were rogue planets discovered? When was the first extrasolar planet discovered? When was the first exoplanet discovered? When ...
I was 17 when I discovered shooting stars.loved them so much that I invited my high school friends to my family farm and spent an August night in our sleeping bags on the hillside to watch them together.I can't help but think of that as the final night of my childhood. I always man...
》阅读理解探究各国国玉Every country in the world has its own flag. Flags were used when a new land was discovered.Whoever first discovered it would plant their flag to mean their occupation of the land.It wasn't until the 18th century that flags began to stand for whole countries. Early ...
The stars were strung across the sky like Christmas lights. These tick all the boxes for passive voice that we’ve been talking about: subjects that receive the action (Chester, stars), forms of to be (was, were), past participles (kicked, strung), and one optional prepositional phrase (...
He can only close his eyes and hope he doesn’t get discovered. Dong-Ik wakes up and picks up the walkie-talkie. He looks out the window and sees the flashlight blinking inside the tent. DONG-IK (into the radio) What is it? YON-KYO Is that Da-Song ? What’s going on?
17. Hardly had the mechanic finished changing the oil when he discovered a leak in the radiator. 18. Hardly had the child finished building the sandcastle when a wave washed it away. 19. Hardly had the sun set when the stars began to twinkle in the night sky. 20. Hardly had the runn...