How long does the Sun take to complete one revolution around the centre of the Milky Way galaxy?
About 225 million years. This is also called the cosmic year or cosmological year.
What was the stage of evolution of the Earth one cosmic year ago?
One cosmic year ago ‘Coal Forests’ still existed on the Earth, which was later transformed into coal deposits. Human beings had not yet appeared on the Earth.
How large is the Sun compared to the earth?
The Sun’s mass is 333,000 times that of the Earth. However, average density of solar matter is only one fourth that of Earth. Hence more than a million Earths would fit inside the Sun. Also, 1098 Earths would have to be placed side by side to equal the diameter of the Sun which is 1,392,000 km.
What is the period of spinning of the Sun about its axis?
Since the Earth’s surface is solid, all parts on its surface rotate in unison. However, since the Sun is appreciably gaseous, it rotates faster in its equatorial region than in its polar regions.
Is the Sun’s axis titled to the plane of the Earth’s orbit?
Yes, by about 70.
Does the Sun have a magnetic field?
Yes.
What is the temperature of the Sun?
The temperature of the Sun is about 60000C near the surface and about 14 million degrees Celsius at the core.