1.explain how the sun is differernt from other stars on the main sequence.how is it different from a giant star? how is it different from a white dwart? 2.outline the past and probable future of the sun. 3.all galaxies outside the local group show a red shift. within the local group, some show a red shift and blue shift.what does this tell you about the galaxies in the local group?4.compare and contrast the theories about the origin of the universe.5.why can paralax only be used to measure distance to stars that are relatively close to earth?6.compare and contrast the sun with other stars on the H-R diagram.7. vega is a star that is 26 light year away. if a spaceship could travel at onetenth the speed of light,how long would it take to reach this star?
2007-06-12 11:21:27 · 7 answers · asked by Anonymous in Science & Mathematics ➔ Astronomy & Space
What makes the Sun different from giant stars is how much fuel (hydrogen) remains. When a star runs out of hydrogen fuel, gravity overpowers the nuclear explosions taking place inside, crushing the star until finally it heats up enough to start burning helium (fusing it into carbon). Then the star expands massively, cooling from yellow-hot to red-hot. It is now a red giant. Eventually, the outer layers are ejected into space, leaving the exposed core of the star, a white dwarf which slowly cools into a brown dwarf.
In the same manner in which a train driving past you at high speeds exhibits a shift in pitch as it passes, light also experiences a frequency shift, depending on whether the source of the light is moving toward you or away from you. The faster it's moving away from you, the more the light gets stretched out, giving a lower frequency (more "red"). The faster it's moving toward you, the more the light is bunched together, giving it a higher frequency (more "blue"). The galaxies that show a red-shift are moving away from us. The galaxies that are blue-shifted are moving towards us.
2007-06-12 11:38:48 · answer #1 · answered by lithiumdeuteride 7 · 1⤊ 0⤋
1..The sun is an ordinary main sequence star. A giant star uses fuel at a much faster rate and will die much sooner. Our sun will become a white dwarf in one stage of it's death.
2..The sun was created from a vast cloud of hydrogen gas about eight billion years ago, it is expected to live for another eight billion years.
3..Galaxies showing a red shift are moving away from our galaxy, those showing a blue shift are coming towards our galaxy. Any one galaxy can show either a red or a blue shift, not one of each.
4..The universe is a collection of galaxies of different shapes that accumulated over a period of fifteen billion light years, there is no other theory.
5..It is just a limitation of a method of measurement.
6..We have already done that.
7..260 years.
2007-06-15 15:46:31 · answer #2 · answered by johnandeileen2000 7 · 0⤊ 0⤋
The sun isnt different at all from others Main sequence because it is one. Giant stars were simply formed from larger cllouds of gas and burn fuel faster (shortening their lifetime). A white dwarf is formed when a star the size of our sun or smaller runs out of fuel, releases most of its mass and leaves behind a compact star called a WD that can last for hundreds of billions of yrs.
The probable future of the sun is that when it runs out of its current fuel ,hydrogen, it will burn its next layer of helium and expand outward possibly engulfing the orbit of Earth. (5 billion yrs from now. After it has used that up it will release much of this mass in an explosion. The sun will collaps into a dense, smaller star called a white dwarf that will shine basically forever.
Red shifted galaxies are moving away. The ligth is strained so it appears red. Blue shift is coming closer-blue is lights most powerful color. In our cluster some are coming towards us (Andromeda will collide in the future with the milky way) and others are moving away. Gravity will probably hold our cluster together for some time.
Big bang theory-all of space and time originated at a single point and first expanded as energy and turned into matter within the first second. Theory is the most accept currently.
Intelligent Design-whether it was God or not our universe was created on purpose. Can fit Big bang theory into it.
5.I'm sorry I dont know what a paralax is.
6 sorry again
7. amount of light years times 12= 260
What kind of astronomy class is this?
2007-06-12 14:43:39 · answer #3 · answered by Matt 1 · 0⤊ 0⤋
well number 7 is the only one i can really help with since it is mostly math. So light travels 300,000 Km/s and how long light travels in a year is a light-year. So, the star is 26 light-years away, it would take light 26 years t oget there. If a spaceship traveled at 1/10 of that speed, it would take 10 times longer, no? so, the answer would be 260 years if im not mistaken. As soon as i can work on the others ill answer them for you :) luckily im learning the same stuff right now.
I can help you out a little with paralax- it is the apaprent movement of objects in the sky, like where the sun rises and sets, or comapred t othe sun, other stars far away will note a change in postion, but it would take 100,000 years on average for us to notice the change.
2007-06-12 11:32:00 · answer #4 · answered by Dvin B 2 · 0⤊ 0⤋
Your textbook has every one of those answers, written in the form that your teacher wants. This is a whole lesson you want done.
I don't have your textbook. And I got better things to do than talk off the top of my head and research what you yourself should be doing for a decent grade. You don't WANT to understand the terms. You want to regurgitate what I say.
Question 3. Red Shift vs Blue Shift. You mean you don't know, didn't read, what that means? Objects receding from, objects approaching? Why should you believe me over a one paragraph explanation in you text?
Question 7 is so painfully simple, you obviously have little interest in understanding your subject. At the speed of light, it would take you 26 years to get there. At one-tenth the speed, it would take you ten times as long. Crimony! Can you do the math?
2007-06-12 11:31:49 · answer #5 · answered by Anonymous · 2⤊ 0⤋
Hello.
Here is a website to help you out:
http://encarta.msn.com/encyclopedia_761557483/Star_(astronomy).html
Hope this helps. Take care and much blessings.
A prudent question is one-half of wisdom.
-Francis Bacon
2007-06-12 11:41:58 · answer #6 · answered by WWJD: What Would Joker Do? 4 · 1⤊ 0⤋
homework
2007-06-12 11:28:33 · answer #7 · answered by anonymous 4 · 0⤊ 0⤋