age of stas?

Question

is it true that the starts we see every night at sky r from the past? i mean they lived millions years ago ,maybe from the time of big bang?

please tell me some simple sites i can read more about that

thanks

i meant AGE OG STARS

Answer 1

The closest star to the Earth, (besides the sun) is Proxima Centauri. It is 4 light years away. That means it takes 4 years for light from the star to reach us. Light moves REALLY fast, so 4 light years is really, really far away.

Besides being far away, 4 light years away means it takes 4 years for the image of the star to reach us. If you find Proxima Centauri in the night sky, the image you look at is 4 years old, because it took 4 years for the light to reach us.

Deneb is the farthest star you can see with the naked eye. It is 1,600 light years away, so we see the image of it from 1,600 years ago.

Yes, the stars in the sky are from the past, but the ones you can see with your naked eyes are at most 2,000 years from the past.

We can't see individual stars from other galaxies, but we can see one galaxy, the Andromeda galaxy. It is 2.5 million light years away, so it is from 2.5 million years in the past.

Remember, stars live for billions of years, so a few million years is nothing.

Answer 2

Most of the bright stars are relatively young (like a billion years or so), because brighter stars burn out faster. The Milky Way's globular clusters appear to be very old, ten or twelve billion years. There's a bright one (M13) in the constellation Hercules that can be seen easily in binoculars. These are what are called Population II stars. The first stars formed after the Big Bang would be Population III, but none have been identified.

Answer 3

Yes, what you say is true. When the light from some star reaches your eye that light has been traveling through space for a very long time, sometimes up to thousands of years. The reason is that it takes light time to move from one place to another. Even the light from our sun takes about 8 minutes to arrive on Earth.

Answer 4

Here is a great start http://hubblesite.org/hubble_discoveries/hstexhibit/stars/
This is the site of the Hubble Spacecraft and more specifically this page is all about stars and new discoveries. You can find allot more sites but this one is great.
www.nasa.org is another great site about stars, sattelites, news and events about space.

Answer 5

Table 1: Data for 47 Tuc and M45 Table 2: Main Sequence Lifetimes
47 Tuc M45
Star Number Magnitude Color (B-V) Star Number Magnitude Color (B-V)
10012 19.6 0.76 133 14.4 1.28
10170 20.6 0.98 165 7.6 0.12
10200 21.0 1.05 345 11.6 0.84
10206 21.0 0.96 522 11.9 0.90
10278 21.6 1.23 697 8.6 0.35
10335 22.0 1.31 804 7.9 0.20
10359 22.2 1.23 950 4.2 -0.10
10489 22.6 1.33 1040 15.8 1.44
10610 23.0 1.45 1103 14.8 1.47
20028 17.6 0.53 1234 6.8 0.02
20034 17.7 0.58 1266 8.3 0.36
20049 18.0 0.57 1305 13.5 1.18
20070 18.4 0.60 1309 9.5 0.47
20104 18.8 0.65 1355 14.0 1.23
20130 19.1 0.69 1432 2.9 -0.09
20185 19.8 0.83 1454 12.8 1.16
20210 20.1 0.88 1516 14.0 1.31
20239 20.4 0.93 1766 9.1 0.47
20335 21.4 1.10 1797 10.1 0.56
20364 21.6 1.20 1924 10.3 0.62
30014 13.5 1.10 2168 3.6 -0.08
30103 15.5 0.82 2181 5.1 -0.08
40002 12.0 1.45 2209 14.4 1.47
40022 12.6 1.25 2406 11.1 0.76
40043 12.9 1.14 2425 6.2 -0.05
40130 14.0 0.99 2588 13.1 1.22
40135 14.0 0.69 2601 15.0 1.55
40144 14.0 0.79 2655 15.5 1.36
40164 14.0 0.59 2870 12.5 1.07
40351 14.9 0.85 2881 11.8 0.86
40628 16.2 0.73
40821 16.6 0.73
41051 16.9 0.70
41107 17.0 0.58
41456 17.2 0.51
Spectral
Type Color
B-V Lifetime
(years)
O -0.4 < 106
B -0.2 3 X 107
A 0.2 4 X 108
F 0.5 4 X 109
G 0.7 1 X 1010
K 1.0 6 X 1010
M 1.6 >1011

Answer 6

i agree with David T.