Basics of Astronomy Worksheet , assignment help

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Answer the following questions 1. What is Earth's Sun in the solar system? 2. What is our Milky Way galaxy including its size?? 3. What is the Big Bang? 4. What is meant by the phase "looking out in the universe is looking back in time?" 5. What is Earth's place in the solar system? 6. How close are the nearest stars to the Sun as compared to the distance between the Sun and the Earth? 7. What is the Sun's position in our Milky Way galaxy, and how is the Sun moving in the galaxy? 8. How many stars are estimated to exist in this galaxy? 9. How old is the Earth compared to the Universe itself? 10. How fast does the Earth move around the Sun compared to spacecraft we have launched? 11. How are other galaxies moving from our point of view on the Earth? 12. What is Polaris, and what is its significance in the sky? 13. How do solar and lunar eclipses occur? 14. Why don't eclipses occur every month? 15. What was the Copernican revolution? 16. What observations did Galileo make that proved that planets go around the Sun? 17. What laws tell about how the planets move around a star? 18. What causes the seasons? 19. Are objects in orbit of the Earth still under the influence of gravity? 20. An object in orbit falls around the Earth. What do planets, comets, and asteroids fall around?
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Answer the following questions
1. What is Earth's Sun in the solar system?
The sun in the earth’s solar system is a star that is at the center of our solar system. Its
about 98% the mass of the solar system. In its size its about 109 times the diameter of
earth and in volume it could hold about one millions earths in it. Its mostly composed of
hydrogen gas followed by helium and other gases such as oxygen, neon, nitrogen etc. its
core has a temperature of about 15 million degrees centigrade and the visible surface is
at a temperature of about 5,500 degrees centigrade driven by nuclear reactions. The sun
is part of millions of stars in the milky way in a generation known as population 1 orbiting
at 25,000 light years from the galactic core.
2. What is our Milky Way galaxy including its size?
The milky way is a barred, spiral galaxy that measures about 120,000 light years in
diameter and about 1,000 light years in thickness. It has two spiral arms known as
Scutum-Centaurus and Carina-Sagittarius. Its composed of stars gases and dust.
3. What is the Big Bang?
The Big Bang is a theory that is used to explain the origin of the universe. This theory
states that around 13.7 billion years ago every sort of matter in the universe was
concentrated into a single tiny point. Then this matter began to enlarge very fast and the
influence of a hot explosion, hence the universe was born. The universe is still expanding
today. In the process of expansion and cooling the energy began to change into particles
of matter and antimatter which destroyed each other. However some...

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