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The radius of the galaxy is 3x1020 m. how fast would a spaceship have to move to cross from one edge of the galaxy to the opposite edge in 300 years as measured by a clock onboard the spaceship?

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The speed will be equal to 6.67 x 10¹⁷ meters per year.

What is speed?

Speed is defined as the ratio of the time it takes for a body to cross a distance to the time it takes. Since it is a scalar quantity, speed cannot be represented by a direction.

Given that the radius of the galaxy is 3x1020 m. The time to cross one edge to another edge of the galaxy is 300 years.

The speed will be calculated by using the formula below:-

S = ( 2 x 3 x 10²⁰ ) / 300

S = 6.67 x 10¹⁷ Meters per year.

Therefore, the speed will be equal to 6.67 x 10¹⁷ meters per year.

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