The closest known black hole is at a distance of about 3000 light-years. And no, there is no immediate risk.
It cannot be known if the earth will ever be destroyed by a blackhole. Certainly our sun could never become one as it does not have sufficient mass. Since the sun is a star. As some stars do when they die, they could turn into a blackhole. So the sun, when it dies, could possibly turn into a blackhole.
The hole in the ozone layer is a natural occurance. It increases the risk of nothing. That the hole gets bigger is a symptom of depletion of the ozone layer in general. Depletion increases the risk of skin cancer, cataracts, mutation, crop loss, and loss of arable land.
If you had the misfortune of being near a smaller black hole, it could take only a fraction of a split second to rip you apart! Good thing there's little risk of that happening any time soon.
Very close to the black hole you have very little worry about Cancer. After you pass a certain place, you won't have the power to escape it and in an increasingly faster and faster manner you will get pulled into the black hole. At certain distances from the black hole, you and bunches or rock and plasma and ice will start being compressed together, as the mess (you and everything else approaching the black hole) becomes more and more compressed ...think tomato to tomato soup to a single super-compressed droplet. Cancer? Try cooked, diced, sliced, baked and pureed. Getting close to a living star is much more of a Cancer risk than a dying one (black hole.)
A programming flaw in a program which can turn out to be a security risk
Running into a black hole is practically impossible because the nearest black hole or soon-to-be-black hole is about like millions of light years away and black holes can only attract things from a few billion km away. You may think that's a lot but believe me, a million light years is way more than a billion km.
It cannot be known if the earth will ever be destroyed by a blackhole. Certainly our sun could never become one as it does not have sufficient mass. Since the sun is a star. As some stars do when they die, they could turn into a blackhole. So the sun, when it dies, could possibly turn into a blackhole.
The hole in the ozone layer is a natural occurance. It increases the risk of nothing. That the hole gets bigger is a symptom of depletion of the ozone layer in general. Depletion increases the risk of skin cancer, cataracts, mutation, crop loss, and loss of arable land.
If you had the misfortune of being near a smaller black hole, it could take only a fraction of a split second to rip you apart! Good thing there's little risk of that happening any time soon.
if its a planet like earth, nothing much. if its the moon or another planet, risk of dying from running out of supply, or get a hole in a spacesuit,hole in spacecraft or home in there house. also may be a risk of micro gravity on the person that's waiting for the people on the moon in space.
Very close to the black hole you have very little worry about Cancer. After you pass a certain place, you won't have the power to escape it and in an increasingly faster and faster manner you will get pulled into the black hole. At certain distances from the black hole, you and bunches or rock and plasma and ice will start being compressed together, as the mess (you and everything else approaching the black hole) becomes more and more compressed ...think tomato to tomato soup to a single super-compressed droplet. Cancer? Try cooked, diced, sliced, baked and pureed. Getting close to a living star is much more of a Cancer risk than a dying one (black hole.)
It is not likely that any black hole gets near the Solar System in the short term - "short term" meaning, the next few million years at the very least. In the unlikely event that a black hole does get into the Solar System, I would guess that the greatest risk is that it disrupts the orbits of planets - perhaps even flinging planets out of the Solar System.
A programming flaw in a program which can turn out to be a security risk
no
No it is not still a health risk! :p
Yes, a hole in ozone layer affect people. It causes people to be in risk for various problems.
looking after Earth