We do not age slower if we go at the speed of light but the time stops when we go at the speed of light. The reality is a object having a definite mass cannot achieve speed of light because mass is dependent on speed and when the object reaches near the speed of light we need infinite force to keep it accelerating.

Since speed is equal to the distance traveled over the time taken, Earth’s speed is calculated by dividing 584 million miles (940 million km) by 365.25 days and dividing that result by 24 hours to get miles per hour or km per hour.

According to relativity, time stands still at the speed of light. Moving at that speed, the second hand on the clock would not have advanced, in the least. No time passes on the clock, traveling at uniform light speed, which means that no time passes during a photon’s journey, either.

As you get closer to a black hole, the flow of time slows down, compared to flow of time far from the hole. (According to Einstein’s theory, any massive body, including the Earth, produces this effect. Near a black hole, the slowing of time is extreme.

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At our sun’s distance from the center of the Milky Way, it’s rotating once about every 225-250 million years – defined by the length of time the sun takes to orbit the center of the galaxy.

The sun, “a big ball of flowing, gassy plasma,” is so big that at its equator a day would be about 24-and-a-half earth days, but at its slower moves poles it would take about 34 earth days.

Astronomers are confident that the Milky Way galaxy has a supermassive black hole at its center, 26,000 light-years from the Solar System, in a region called Sagittarius A* because: No known astronomical object other than a black hole can contain 4.1 million M ☉ in this volume of space.

Stellar-mass black holes are typically in the range of 10 to 100 solar masses, while the supermassive black holes at the centers of galaxies can be millions or billions of solar masses. The supermassive black hole at the center of the Milky Way, Sagittarius A*, is 4.3 million solar masses.

The surface area of a black hole is proportional to that black hole’s mass. Which is exactly the same as saying a black hole’s apparent mass is proportional to its surface area. So a “bigger” black hole is one which has a larger surface area and also more apparent mass.

Any object with mass, such as a planet, moon, or a human, has a Schwarzschild radius. If an object’s physical radius becomes smaller than its Schwarzschild radius this object will become a black hole. The Earth’s Schwarzschild radius is thought to be around 8.7mm, or roughly 17.5mm in diameter.

Gravity is gravity and mass is mass — a black hole with the mass of, say, the sun will pull on you exactly the same as the sun itself. All that’s missing is the wonderful heat and light and warmth and radiation. The black hole itself is a singularity, a point of infinite density.

As you get closer to a black hole, the flow of time slows down, compared to flow of time far from the hole. (According to Einstein’s theory, any massive body, including the Earth, produces this effect.