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The sun has about 5 billion years worth of hydrogen left before it exhausts its supply and evolves into a red giant star.
G2 stars like the Sun live about 10 billion years. Our Sun is about 4.5 billion years old, so it has another 5 billion years left.
1/4: Half would be gone after a billion years and half of that would be gone in another billion years. 1/4: Half would be gone after a billion years and half of that would be gone in another billion years. 1/4: Half would be gone after a billion years and half of that would be gone in another billion years.
One eighth would be left.
In my opinion, I think the years were longer than they are now 2 billion years ago. No one will really ever know since there is no calendars that have been left behind from 2 billion years ago.
When rifled, the rifling tool cuts the GROOVES. Material left between the grooves is the LANDS.
Depends on how many grams you started with, but obviously if half decays, half is left.
The fossil would be approximately 600 years old. We can calculate this by determining how many half-lives have passed based on the remaining 25% of the original radioactive material. Since the half-life is 200 years, and with 25% remaining, it means two half-lives have passed (50% after first, 25% after second). Therefore, 2 x 200 = 400 years.
most likely, the end of the sun would be because of its age. it only has about 4 billion years left. A star's lifetime is about 15-20 billion years.
2 seconds my friend did that there 5 billion years left or so
half a billion years left. But that does not mean that PEOPLE will last that long. ;-)
The planet has a few billion years left on it. As for the creatures riding it, who knows.