What is the mass of the Milky Way?

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We can consider the Sun to be a satellite of the Milky Way. The Sun revolves around the center of the Milky Way with a radius of 8 kpc. The period of revolution is 230 million years. What is the mass of the Milky Way?
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If the solar system were reduced

Solar System (artist's impression) If all the linear dimensions of the solar system were reduced in some proportion, then what will be the length of Earth’s year?

 

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How long does it take for the Earth to reach the Sun?

Earth
If we stopped the Earth in orbit then how long does it take for the Earth to reach the Sun?

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Why is the Earth Round?

EarthNasaThe Earth, the Moon, the Sun, the stars and the planets round or spherical, because they have a very large mass. Their own gravitational force aims to give them the shape of a sphere.

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Aladdin’s Challenge

genieLampHeartAladdin saw the Sultan’s daughter, Princess Jasmine. Aladdin loved her at first sight and asked the Sultan’s permission for the Princess to marry him. Sultan said: “When I see the sun rises in the west and sets in the east. Then you will marry her.”
Please help Aladdin solve this problem.

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How long does it take sunlight to reach the Earth?

SunEarthNasaImage Credits: NASA

 
 
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Moon, Sun Or Both About Equally

imageImage Credit: NASA

The Moon is most responsible for Earth’s tides. Which pulls more strongly on the Earth and its oceans?

A) Moon

B) Sun

C) Both about equally

Source: forum.understandingbasics

 
 
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