. d. They hurt real clowns.A. ab B. bc C. ad D. cdDay 4Big rock passes Earth (P6)Choose the answer... once got closer to Earth than to the moonB. Florence is usually 7 million km away from EarthC ……

on it.Watch out! An asteroid (小行星) known as JF1 is coming towards Earth. The rock is as big.... The rock is as big as the Great Pyramid of Giza (吉萨金字塔) in Egypt. According to NASA (美国 ……

astronomers for years: The idea that one big collision between the Earth and a Mars-sized planet gave birth... the incoming planet and melt Earth all the way through, Canup said. Some hot rock debris would also ……

. As it goes down the road, the sand flies up in the air behind it. It is this that the Earth passes through... when the Earth crosses the path ofdebris(碎片) left bycomets(彗星) as they orbit the sun. Each time ……

Pole to poleTeacher: What is the axis (轴) of the Earth?Student: The axis of the Earth is an imaginary (想象的) line, which passes from one pole to the other, and on which the Earth revolves (旋转).Teacher ……

on Earth – or Uluru, a big rock that sits 348 meters above the ground in the central Australian desert. Many visitors to Uluru climb the rock even though there’s no road to it, except for a chain-and-pole ……

石砸中的概率有多大？被陨石砸中的概率有多大？Imagine that when you are sleeping, a big rock falls through your roof (屋顶.... Nothing will happen to your body. Imagine that when you are sleeping, a big rock falls through your ……

breathe on Earth. They also found out the planet is not heavy enough to be made of rock.  ...Ten tons of space dust hit Earth every day. QIANTUShowering by space dustsShowering by space dusts ……

a shadow on Earth as it passes between Earth and the sun. A partial one is more frequent than the total eclipses that occur when the moon passes within the penumbral cone (半影锥) of Earth, making it look ……

On Feb 15, two objects from space visited Earth on the same day. One guest, an asteroid (小行... 2012 DA14, as expected, traveled past Earth from south to north. That was the closest pass of any large ……

eclipse of the sun, when the moon passes between Earth and sun, will occur on Dec 4..... TUCHONGDid you see the partial lunar eclipse (月偏食) on Nov 19?During a lunar eclipse, Earth moves ……

旅行者2号即将飞离太阳系。Which places have humans been to in our solar system (太阳系)? Beyond Earth, humans have only been to the moon. But Earth and the moon are just specks (微粒) of dust in our huge solar system ……

becomes the sun. 4.Then a big cloud passes. It blocks (遮挡) out all the sun’s light. “I’m just...最终他会变成什么呢？1.A poor stone cutter chips (凿) at a rock. Then a rich man walks past. “I’m just a poor stone cutter ……

of?A. It's made of Xuanwu rock from the moon. A. It's made of Xuanwu rock from the moon. B. It's made of Xuanwu rock from Earth. B. It's made of Xuanwu rock from Earth. C. It's made ……

不眨眼睛哦！Twinkle, twinkle, little star… But, stars don’t twinkle (闪烁). Stars' light passes through Earth’s air....Did you know?The light from stars takes millions of years to reach Earth.Shooting stars 流星 ……