What part of the planet formed first? Jupiter and Saturnare thought to have formed first and quickly within the first 10 million years of the solar system. In the warmer parts of the disk, closer to the star, rocky planets begin to form. ...
Pluto, which had at that time been known as a planet, was downgraded. Instead of being downgraded to an asteroid, it became a dwarf planet. A dwarf planet is a small planet that fails the third test. The asteroid Ceres, in orbit around the Sun between Mars and Jupiter, was upgraded fr...
Stars that are much larger than the sun are called what? What was the first planet discovered with a telescope? What was the first planet to be discovered by telescope? Who discovered the constellation Virgo? Who discovered the Big Dipper constellation?
根据第一段“What if the Moon had never existed? For starters we know that the geophysical and climatological history of the Earth would have been different. Although there is still large uncertainty about how the Moon was formed, the most currently favored theory describes a disastrous collision ...
The first company was formed to make robots thatyear. And five years later, in 1961, people successfullymade a robot which could really work. This robot workedin a car factory. And in 1963, a kind of robot was made towork for handicapped(残疾的) people.In about 1970,the first robot ...
Temperatures eventually became high enough to “bake out” any carbon dioxide that was trapped in carbonate rocks. This liberated carbon dioxide formed the thick atmosphere of present-day Venus. Over time, the rising temperatures would have leveled off, solar ultraviolet radiation having broken down ...
What star is at the center of our solar system? When does a protostar become a main-sequence star? How does a protostar become a star? Who started the space program? What is VY Canis Majoris made of? What was the first extrasolar planet discovered? Where are newly formed stars found in...
When a planet gets big enough, when it acquires enough mass, it migrates inwards towards the star. Understanding this phenomenon was a real revolution.当一颗行星变得足够大，当它获得足够的质量时，它会向恒星内部迁移。理解这一现象是一场真正的革命。Planetary migration explains why the majority of ...
World-famous marine biologist Sylvia Earle poses her famous "what if" questions to inspire people to reflect on how they can help save the ocean.In 1998,Time magazine named Earle its first "Hero for the Planet." Earle's move to Florida's west coast at age 12 is what started a lifelong...
C. It's confirmed that Uranus looks blue. D. It's found there's hydrogen on Uranus.33. What was the scientists' former attitude to Uranus's HS?( A. Undoubtful. B. Favorable. C. Cautious. D. Tolerant.34. What does the last paragraph focus on?B A. The detection of Uranus's ...