Space is life giving entity but sometimes it can cause enormous harm ever predicted. We have taken thousands of years to become modern since space destroyed dinosaurs by bombarding objects on earth. Water on earth is may be result of such bombardments of watery rocks. There is no restriction on nature to destroy life if it wants and we are tiniest in front of immense power of nature but we should defense ourselves as nature given us understanding and resources.
Among all, danger of meteorites, electromagnetic field (ozone layer destruction), solar winds, danger from moon, tides by meteorites, comets as well as failing of artificial satellites are may be main reasons to be afraid.
1. Meteorites Physics becomes a strange and idealized thing is a wonderful thing about space.What are the effects for the human population if an asteroid collide on the earth ? Today’s research direction is affected by this question. Activities that address the threat of asteroids that collide with Earth can be significantly controlled by space science.
Asteroid impacts produce wind blast, overpressure shock, ejecta deposition, thermal radiation, cratering, seismic shaking, and tsunami. Severity of each impact effect needs to be calculated based on input parameters such as impactor size, impactor density, impact speed, and impact angle to assume loss on impact of any asteroid. At each100 million years or so, catastrophe strikes in the form of a rock occures. The last one killed three-quarters of all life on Earth including dinosaurs . The effects on humans could be equally devastating as todays development taken thousands of years. In 2020 NASA identified 90 percent of asteroids 450 feet or larger and they’re making good progress on finding more.
Destroying a massive rock miles across is difficult work by current technology, and in the best case, you still end up with a cloud of small debris which remains after collapse, which could still pose risks. So experts focus instead on nudging these asteroids out of Earth’s path which may be easier option.We know most of these objects are in between Mars and Jupiter planet. If they’re coming our direction, we’d likely have enough time of advance warning and it may be in years.
Space is large and empty enough that a gentle nudge would be all that’s required to save the earth. Better understanding will minimize the asteroid impact hazard, and it can be of help in formulating an adequate response to the threat. Simply exploding a bomb or nuclear bomb near the surface of the offending asteroid could be enough to alter its trajectory as there is no significant gravity. We could blast it with a laser also. But since we don’t currently have a giant space laser, this method requires a bit more planning. All of these methods require some advance warning andasteroids large enough to end life on Earth are big enough to spot, so we’ll have plenty of time to plan.
2. Electromagnetic field Enveloping earth and protecting us from the fury of the Sun is a giant bubble of magnetism. It is called the magnetosphere. It deflects most of the solar materials like radiation and solar winds sweeping towards us from sun at 1 million miles per hour or more. Without it, the action of these solar particles could strip the Earth of its protective layers including ozone layer, which shield us from the Sun’s ultraviolet radiation. If Earth lost its magnetic field, our power grids would be more vulnerable than ever, and even our computers and other electronics would be damaged if a solar storm struck. We should have large enough electromagnet to cope with dangers may arise in case of loss of magnetic field of the earth.
3. Solar winds Solar storms aren’t dangerous to us on Earth’s surface because of magnetic field of the earth. Earth’s blanket of atmosphere protect us from hazardous effects of it. Solar storms contain very high-energy particles which can cause radiation poisoning to humans and other mammals. They would be dangerous to unshielded astronauts traveling in space.
4. Moon The moon influences life as we know it on Earth by balancing earth around the sun. It influences weather, our oceans, and the hours in our days. Tides would fall, seasons would change, nights would be darker, and the length of our days would alter without the moon, . A new study conducted by NASA has found a ‘wobble’ in Moon’s orbit along with rising sea levels will lead to destructive floods till the 2030s. Referring to the natural calamity as ‘nuisance floods’, the study said the events would become more frequent and erratic and the coastline of the US will majorly face the brunt of it. All major ports are on the coastline and significant population may be under danger if sea come out from boundary.The ‘wobble’ in the Moon’s orbit takes 18.6 years to complete and it will combine with the rising sea levels due to the planet’s warming, which will be dangerous. If any asteroid strike on moon and it explode, earth can’t be a safe place for humans and life.
5. Comets Most of the asteroids and comets in our solar system are not dangerous to the earth. But, there is one with an orbit crosses that of Earth for every thousand or so of those objects, posing the possibility of a collision at some future time.
6.Artificial objects in space Space junk is a growing problem in Earth orbit as our majority systems works by satellites. It doesn’t pose high risk to space explorations, but the biggest danger it poses is to other satellites in orbit. These satellites path should be clear to make sure they don’t get hit and potentially damaged or destroyed. Impacts by millimetre-size debris may cause local damage or disable a subsystem of an operational spacecraft. Collisions with debris larger than 1 cm would may cause the explosion of a decommissioned spacecraft or rocket body and disable an operational spacecraft.