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Now we are getting more specific, more mathematical, but it still doesn't tell us what time is.

I will attempt to give an operating definition here, one that is useful in understanding time travel. To measure time we need periodic and repetitious motion.

He showed that stars closer to the galactic center, including the Sun, experience a gravitational pull equal to the pull created by the mass that is equal to that of all the stars closer to the galactic center.

Hence, the mass of the galactic center is equal to the total mass of all the stars closer to the center.

The mass is located within the circle of the Sun's orbit through the galaxy is about 100 billion times the mass of the Sun.

Based on a distance of 30,000 light years and a speed of 220 km/s, the Sun's orbit around the center of the Milky Way once every 225 million years. The Sun has orbited the galaxy, more than 20 times during its 5 billion year lifetime. Some of the galaxy's mass is inside the sun's orbit and some of it is outside.

Therefore, the stars closer to the center experience a gravitational pull towards the center and they move at greater speeds, since there is more force acting upon them.

Conversely, more distant stars have less force acting upon them and in turn, they travel at lower speeds.

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The rotation of the earth on its axis is another motion we use to measure time.

The Sun's orbital period is determined by the galaxy's mass within the orbit of the Sun.

Newton's explanation of the speed of stars in the Milky Way is as follows.

Reid and his team made the measurement using the Very Long Baseline Array, a system of 10 large radio-telescope antennae placed 5,000 miles across the United States, from the U. The accuracy is such that the VLBA can look at a bit of sky that has an apparent size one ten- thousandth the diameter of a human hair held at arms length.

For their solar system measurement, the astronomers focused on Sagittarius A, a star discovered two decades ago to mark the Milky Way's center.

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