Is stars form into black holes during it dieing days, Then is safe to bet on our star going for black holy and at the minimum sucking the first three planets up?
So in the long run, all that we have built will build and thought of building will pretty much be worthless since we have would cease to exist?
Our star will never become a black hole, it does not have enough mass. In roughly 5 Billion years from now it will become a red giant, it will make earth uninhabitable, but may not destroy it outright.
So we have some time to prepare.
Unfortunately, as is the case with most group projects, this one will be put off until the last possible second.
Somehow I don't think there are gonna be any humans in 5 billion years. Even if we had a body plan as perfect as a shark or a crab ,resisting evolution that long is gonna be pretty hard. Also the inherent instability of human civilization.
Eventually, as the sun swells, it will eventually consume the first three planets. But this would be hundreds of millions of years or even billions of years after it is burnt earth to a crisp.
Even if the sun would turn into a black hole, it wouldn‘t suck earth into it. The black hole would have the same mass so earth would stay on the same orbit.
I could be wrong but when large stars collapse I believe their gravity stays mostly the same, such that most things in orbit are uneffected.
You’re correct. The mass stays the same when a black hole forms so anything in orbit will stay in the same orbit.
The sun won’t turn into a black hole though. You need at least 5 times as much mass as the sun for a star to turn into a black hole.
https://wisconsin.pressbooks.pub/astronomy/chapter/chapter-24-section-24-5-black-holes/
https://en.wikipedia.org/wiki/Solar_radius
At about 0.01 au (two solar radii would be 0.0094), the sun as a black hole would not affect the Earth, nor Venus, nor Mercury.
https://science.nasa.gov/mercury/facts/
Based on that, we would stay put. A black hole does not emit light, including sunlight. Sunlight warms our planet (so it's going to get mercilessly cold). Many plants would die and they would stop making oxygen. And while you can argue that we can't live without heat from the sun, with 8 billion humans plus all the animals on the planet, I suspect we'll run out of air before the cold kills us. But I could be wrong about asphyxiating before freezing to death.
See also https://science.nasa.gov/universe/what-happens-when-something-gets-too-close-to-a-black-hole/
Edit: as others on here have noted, our star isn't big enough to become a black hole. The above assumes "But what if it did?"
Depends where you are at the time.