I have always been interested in the workings of Time.
I have always been interested in the workings of Time... and know a lot about it. Love time travel stories and Einstein is my hero... but today I learned something new. Obvious, but new to me. In the information below, I enclosed what was new to me in parentheses ( ) in the 3rd paragraph.
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In space, light and time act differently than here on Earth, and speed is a different concept when time can theoretically be stopped in its tracks.
The speed of light is 186,000 miles per second, or approximately 670 million miles per hour. Nothing in the universe travels faster than light: at the speed of light, time stops. No matter how fast you are moving when you observe it, the speed of light will always be 186,000 miles per second. In physics, the three dimensions of space and the fourth, separate dimension of time combine to form a single construct throughout the cosmos called space-time. Using space-time, scientists can measure both the place and time something occurs in one.
Time is relative to the person observing it and time may change depending on how fast the observer is moving. Time passes more slowly for satellites in orbit when compared to time on Earth because those satellites are moving. (Satellites used for the Global Positioning System are launched with their clocks running faster so that when they reach orbit they mark time the same as Earth-based clocks.) Because time passes more slowly in orbit around Earth, astronauts arrive home a little younger than if they had spent the same amount of time on Earth. If you were to travel near the speed of light for what seems to be 20 years, you would return to Earth thousands of years in the future.
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In space, light and time act differently than here on Earth, and speed is a different concept when time can theoretically be stopped in its tracks.
The speed of light is 186,000 miles per second, or approximately 670 million miles per hour. Nothing in the universe travels faster than light: at the speed of light, time stops. No matter how fast you are moving when you observe it, the speed of light will always be 186,000 miles per second. In physics, the three dimensions of space and the fourth, separate dimension of time combine to form a single construct throughout the cosmos called space-time. Using space-time, scientists can measure both the place and time something occurs in one.
Time is relative to the person observing it and time may change depending on how fast the observer is moving. Time passes more slowly for satellites in orbit when compared to time on Earth because those satellites are moving. (Satellites used for the Global Positioning System are launched with their clocks running faster so that when they reach orbit they mark time the same as Earth-based clocks.) Because time passes more slowly in orbit around Earth, astronauts arrive home a little younger than if they had spent the same amount of time on Earth. If you were to travel near the speed of light for what seems to be 20 years, you would return to Earth thousands of years in the future.
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