Stack Exchange Network

Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [metal]

Any element other than hydrogen and helium is considered a metal by astronomers.

7
votes
3answers
132 views

Why can't a quasistar exist now?

From my research, I found out that quasistars theoretically existed because of a black hole core whose radiation pressure counteracted gravity within the star. However, a few websites stated that ...
4
votes
2answers
539 views

Does Gold really come from Supernovas? [duplicate]

Do we really know that the origin of gold was in a supernova explosion? I am talking about the gold we find here on Earth. So then how are we sure that Gold actually came from these explosions. Did ...
5
votes
2answers
470 views

Why are stars more metallic closer as you move closer to the galactic bulge?

As I see it, most of the stars in the galactic bulge are Population I stars. However, as one moves farther from the galactic bulge, star metallicity decreases. In fact, halo stars are almost entirely ...
6
votes
1answer
398 views

What are the most valuable meteorites and asteroids in terms of precious metals?

There were some suggestions that asteroids could one day be mined for precious metals. I have found an outdated study that says that some siderites contain as much as 0.001% of gold: http://pubs.usgs....
8
votes
2answers
1k views

Why you use log to measure metallicity in galaxies?

For example, I saw the next expression for matallicity in a paper: $\log(O/H) + 12$. I understand O/H is the O(Oxygen) to H(Hydrogen) ratio but why is there the number 12? And why the logarithm?
3
votes
0answers
213 views

If two pieces of the same type of metal touch in outer space, they will bond together permanently? [closed]

Is this true? And if so, why? http://www.snapple.com/real-facts/cap-view/1003
4
votes
1answer
161 views

Is metallicity low at the central region or nucleus of the Milky Way?

Is metallicity low at the central region or nucleus of the Milky Way? Does metallicity decrease or increase as we move from the center out to the edges of our galaxy?
3
votes
0answers
59 views

What is the reason for the dispute over the variation of core mass with heavy metal abundance?

In Metal-Poor Stars IV: The Evolution of Red Giants, Rood writes The differences in the results of these papers are large enough to introduce appreciable uncertainties into the study of the ...
6
votes
3answers
2k views

Metal distribution in our solar system

The sun dominates in our solar system. I wonder whether in every aspect the sun plays the most important role in our system. For example, all kinds of metals are mainly located in the sun instead of ...
1
vote
1answer
206 views

Where/how are metals distributed in our universe?

For one particular kind of element, what is the distribution in the whole universe? Are most of the metals located in ISM, IGM, or stars? Maybe different metals have different distributions? For ...