Read some news and saw some stuff about like 7 seconds being a year on earth or like living up to 3158 years on another planet. How does that work. Like do i actually feel 3158 years cause to me is that i’ll still feel and live the same amount of time
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In ELI5 terms (ignoring gravitational distortion, or near light speeds) time is the same everywhere. What it sounds like you are referencing is how long a day or year is on another planet. That’s dependent on how fast a planet spins on its axis, or rotates around its sun.
So, say a planet makes on axial rotation every 8 hours. That means it takes 3 of their days to equal one of ours. Same with years. Their planet makes on complete orbit of their sun in 3 of our months the for every one of our years, they experience 4 years. So, by their calendar, someone who is Twenty years old on Earth would be 80 of their years old.
No, one second is still one second. Setting aside gravitational effects (which get beyond ELI5 really quickly) they are specifically talking about time measurements based on physical phenomenon. That is, days and years.
A “day” is a unit of time based on how fast the Earth rotates. When it rotates a single time. That’s a day. Similarly, a “year” is a unit of time based on how fast the Earth revolves around the sun. When it completes a revolution, that’s a year.
Different planets rotate and revolve around the sun at different rates. And sometimes we express those rates relative to Earth. For example, Mars rotates every 24.6 hours which is only slightly longer than Earth. By comparison Venus rotates once every 243 *Earth* days. So one day on Venus is equal to 243 days on Earth.
And the years works the same way. Mars takes 687 Earth days to revolve around the sun. So one year on Mars is almost 2 years on Earth.
This is referencing the spin of other planets and their orbits. One earth day is 24 hours because that’s how long it takes the earth to complete one rotation and one earth year is how long it takes the earth to orbit the sun once. Other planets spin at different speeds so their days are different lengths which we can convert to a number of earth days. Same with years. other planets years will have a different number of days than earth because of different orbits
It’s all the same amount of time it’s just different reference points
Naw dawg you wouldn’t feel time moving differently
So like, on Mars for instance the planet spins on it’s axis at a similar speed to earth, so a “day” on Mars takes about 24.5 hours. It takes that long in between sunrises or sunsets on Mars.
For Mars to go around the sun, it takes the length of 687 earth days (or 668 Martian days) so about twice as long to see the seasons change, or experience the things we experience associated with a year.
But if you lived on Mars for 10 Martian years, your body would still age as much as if you spent the same amount of time on earth (about 19 years)
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It’s tough to explain because most people don’t realize that we actually use two different measures for time, even right here on Earth. The first, most daily-life time scale is the second and from it we derive minutes, and hours. It is defined by the frequency of a particular particle (I forget which one) and is considered a Fundamental Unit. The second is the year, which is a measure of how many seconds it takes the Earth to make a complete circumnavigation of the sun. There are at least two variables in that statement, though. The Sun – if you change which star you’re talking about, the length if a year changes, because the orbit would necessarily change. The Earth: because if you change which planet you’re using, the length of a year changes, again because the orbit nessarily changes. The number of seconds that actually pass doesn’t change at all and because how old you feel is dependent on the number of seconds you’ve experienced, it doesn’t matter which planet you’re on or how you measure years: if you’ve experienced 10,000,000 seconds, you’ll always feel as if you’ve experienced 10,000,000 seconds, even of that’s 5 years (didn’t do the math) on Earth and 40 years on Mercury or less than a year on Neptune.
Side question for everyone, though: is a year on Luna the same as a year on Earth? How about Io and Jupiter? Or do we measure a year based on the orbit around the parent body vice around the parent star?
No. All they mean is that a “day” is how long it takes for the planet to spin around one time. On Earth the day is 24 hours. But other planets might spin faster or slower, so the day could be shorter than 24 hours, or it could be much longer. On a planet with, say, a 10-hour day, you would see the sun rise, set, and then rise again, after only 10 hours, whereas here it takes 24.
And then some planets the *year* is longer or shorter than our year, which happens to be 8,766 hours. This is less important. A “year” isn’t something you’d really notice, unless it results in the planet having seasons. A year is just how long it takes for the planet to make one full rotation around the sun, which you would never notice unless you spend a *lot* of time looking at the sky. Some planets are closer to their sun and/or moving faster, so their year is shorter. Some planets are farther away from their sun and/or moving slower, so their year is longer.
None of this would have any effect on your subjective feeling of time. An hour would still feel like an hour to you, no matter where you are.
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