When we are looking at Alpha Centauri, it means that the light emitted by this star was ……….years ago that reaches the earth.
a)4.3
b) 6.5
c)8.6
d) 1.5
Which of the following is our neighboring galaxy?
a) Sires
b) Andromeda
c) NCG 1569
d) ESO-305-G004
When we are looking at Andromeda, it means that the light emitted by this galaxy was …….million years ago that reaches the earth.
a) 2.4
b) 6.5
c) 8.6
d) 1.5
Death of the Sun:
In about 5 billion years from now, the sun will begin to die. As the Sun grows old, it will expand. As the core runs out of hydrogen and then helium, the core will contract and the outer layers will expand, cool, and become less bright. It will become a red giant star.
The nuclear
reaction at the core of the sun will continue for another……….billion years.
a) 4
b) 5
c) 1.6
d) 1.5
What will happen when the sun runs out of nuclear fuel?
a) the sun will disappear
b) the sun will grow into red giant
c) the sun will become black hole at once
d) none of these
