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amannishad0512p5zxh6:
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a) ⭐
The methane in Uranus' upper atmosphere absorbs the red light from the Sun but reflects the blue light from the Sun back into space. This is why Uranus appears blue. Uranus and Neptune are blue or blue green for the same reasons, methane in the atmosphere.
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b) ⭐
Mercury is closest to the sun, this is true. However, because of its proximity to the sun it lacks an atmosphere. Mercury's gaseous molecules reached escape velocity long ago and the atmosphere was 'burned off' leaving a vacant wasteland of rock with a similar surface to the earth's moon. There is nothing to hold in solar radiation, thus is flies out into space.
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c) ⭐
The half of the Moon that points toward the Sun looks bright because it is lit by sunlight. The Moon appears to change shape because we see different amounts of the lit part as the Moon orbits Earth. When the Moon is between Earth and the Sun, the lit side is hidden from us. As it moves around Earth, more and more of the lit side comes into view. Then it begins to disappear again.
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d) ⭐
A star appears to rise 4 minutes earlier in the sky everyday because, By the time Earth goes around its axis once, it has moved in its orbit by almost 1°. The stars appear at the same angle, but compared to sun's position , it is shifted by1°. If 360° takes 24 hours (to rotate), for a degree it takes
24hrs / 360° = 1hr /15° = 60mnts / 15° = 4mnts / 1°.
It is all with respect to Sun's position by which we calculate the time daily.
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e)⭐
Comets are icy bodies in space that release gas or dust. They are often compared to dirty snowballs, though recent research has led some scientists to call them snowy dirtballs. Comets contain dust, ice, carbon dioxide, ammonia, methane and more. Astronomers think comets are leftovers from the material that initially formed the solar system about 4.6 billion years ago.
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