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Sagot :
32. A
explanation:
- When viewed from the Earth, a meteor, a celestial body which entered the Earth's atmosphere, can be seen as a streaking light going downwards that is also called by many as a shooting star. Meanwhile, a comet, which did not enter the atmosphere, is also seen to be a streaking light but has a longer tail.
33. B
explanation:
- A meteor is a streak of light in the sky caused by a meteoroid crashing through Earth's atmosphere. When a meteoroid enters the Earth's upper atmosphere, it heats up due to friction from the air. The heat causes gases around the meteoroid to glow brightly, and a meteor appears.
34. C
explanation:
- A meteor is a streak of light in the sky. A meteor, sometimes called a shooting star or falling star, is actually a space rock that is crashing through Earth's atmosphere. This meteor is streaking across the sky above Chelyabinsk, Russia, in 2013.
35. A
explanation:
- Meteor showers occur when the earth in its orbit around the Sun passes through debris left over from the disintegration of comets. When the earth intersects this orbit in its annual trip, it can run into this debris, which burns up on entry into the earth's atmosphere, producing a visible shower of meteors.
36. B
37. B
explanation:
- 76 Earth years
- Halley's orbit period is, on average, 76 Earth years. This corresponds to an orbital circumference around the Sun of about 7.6 billion miles (12.2 billion kilometers). The period varies from appearance to appearance because of the gravitational effects of the planets.
38. A
explanation:
- origin of meteoroids?
- Many meteoroids are formed from the collision of asteroids, which orbit the sun between the paths of Mars and Jupiter in a region called the asteroid belt. As asteroids smash into each other, they produce crumbly debris—meteoroids. Other meteoroids are the debris that comets shed as they travel through space.
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