Question

20 PTS!!!!!!

1. what will happen to the relative amounts of hydrogen and helium in the sun over the next few billion years?
Hydrogen increase and helium decrease
Hydrogen decrease and helium increase
Hydrogen and helium decrease
Hydrogen and helium will remain the same

2. For the sun to be stable the inward and outward forces within the sun must be
Equilibrium
part of the fusion reaction
focused in the core
balanced with temperature and energy

3. A hot, bright star would appear in which section of an H-R diagram?
lower left
upper right
upper left
lower right

4. All stars remain on the main sequence
until they stabilize
for about 90% of their lifetimes
until they become protostars
for about 10 billion stars

5. All the planets in the solar system have _______ except venus and mercury

Answer 1

1B, 2A,3C,4B, and don't know number 5

Answer 2

1. Hydrogen decrease and helium increase

2. Equilibrium

3. Upper Left

4. for about 90% of their lifetimes

5. Moons

Step-by-step explanation:

1. As the Sun will get older the Hydrogen in the core will decrease and amount of Helium will increase. There will be a time when hydrogen will finish up in the Sun and fusion of helium will start thus making new elements.

2. The shape of the Sun is maintained when there is an equilibrium between the outward thermal pressure and inward gravitational pull.

3. Such stars will be placed on the upper left of the HR diagram which is a plot showing the relation of stars absolute magnitude and luminosity versus their temperature and spectral class.

4. A star spends around 90% of its lifetime as a main sequence star.

5. Only Mercury and Venus do not have moons out of all the planets in the Solar system. Rest all the 6 planets have at least one moon with Jupiter having 79 of them.