E. Long-answer Questions
1. Why is the earth considered a unique
planet?
2. Explain the various phases of the moon.
3. Write a short note on the Milky Way galaxy.
4. What are asteroids and comets?
5. Write short notes on
rete
a. Moon
b. Jupiter
6. What are constellations?
Answers
Answer:
While the planets and moons have changed over the millennia, many of these small chunks of ice, rock and metal have not.
Answer:
1 because it is a habitable planet which supports life in all our solar system To enable life, this most special of attributes, planet Earth has a number of ideal features. It is unique among planets in our solar system for having water in its liquid form at the surface, in an amount conducive to life evolving.
2 Phases of the Moon
New Moon- The Moon is positioned between the Sun and the Earth so that the side of the Moon that is viewed from Earth is cannot be seen. Because of this, there appears to be no Moon in the night sky.Full Moon- The Sunlit portion of the Moon is facing the Earth while the Earth is positioned between the Sun and Moon. The Moon is visible in the sky.The Sunlit portion of the Moon that is visible from Earth appears to either increase (waxes) or decrease (wanes), as the Moon orbits the Earth. Crescent Moon-either waxing or waning; less than ½ of the Sunlit portion of the Moon is visible.Gibbous Moon-either waxing or waning; Greater than ½ of the Sunlit portion of the Moon is visible.First/Third Quarter-1/2 of the Sunlit portion of the Moon is visible.A first quarter follows the waxing crescent.A third quarter occurs when ½ of the Moon is visible.
3The Milky Way is our home galaxy. It contains over 200 billion stars, including our Sun. The Milky Way has a diameter of about 170,000 or 200,000 light years, and is a barred spiral galaxy. The idea that the Milky Way is made of stars goes back to the Ancient Greek philosopher Democritus
4 A comet is an icy, small Solar System body that, when passing close to the Sun, warms and begins to release gases, a process called outgassing. This produces a visible atmosphere or coma, and sometimes also a tail.asteroid is a small rocky body orbiting the sun. Large numbers of these, ranging enormously in size, are found between the orbits of Mars and Jupiter, though some have more eccentric orbits.
5.a)The moon is the only natural satellite of our planet earth. Its diameter is just about a quarter of the earth's diameter. It is comparatively close(3,84,400 kilometres away) to earth than all other celestial bodies. It does not support life. It revolves around the earth and rotates about its own axis in about the same time, due to which only one side of the moon is visible to us.
b)Jupiter is the fifth planet from the Sun and the largest in the Solar System. It is a gas giant with a mass one-thousandth that of the Sun, but two-and-a-half times that of all the other planets in the Solar System combined. ... Surrounding Jupiter is a faint planetary ring system and a powerful magnetosphere.it has 79 moons
7.A constellation is a name given to a group of stars in the sky that make up a certain pattern. ... There are 88 named constellations, and they take many forms, including mythological creatures, animals, people and objects. The name is usually given based on the shape made by the brightest stars within the constellation
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