Author Question: Open clusters and young stars are generally found only in the disk of the Milky Way and not in the ... (Read 71 times)

jeatrice · **on:** Jul 27, 2018

Open clusters and young stars are generally found only in the disk of the Milky Way and not in the halo.

Indicate whether the statement is true or false

Question 2

How has the chemical composition of the Sun changed in the last 4.5 billion years? How will this affect its future?

What will be an ideal response?

reelove4eva · **Reply #1 on:** Jul 27, 2018

Answer to Question 1

TRUE

Answer to Question 2

The core was almost all hydrogen to start with, but with fusion reactions the helium content of the core has increased. As a main-sequence star, it will continue to brighten slowly for the next five billion years, then when the core is dominated by helium, the core will contract and heat up, forcing the photosphere outward and swelling it up into a red giant, probably burning up the Earth in the process.