Life on Earth has never been ‘invulnerable’. For the past few million years, our planet has been on the receiving end of many catastrophic events that eradicated a substantial portion of life forms from its surface. Scientists believe that these previous extinctions were caused either by violent volcanic eruptions or major asteroid impacts. They are almost certain that it was an asteroid impact that initially started the chain of events that resulted in the extinction of the dinosaurs around 60 million years ago. So, what does it mean for us? Are we next in the queue? And if we are, can we protect our kind or preserve our legacy?
Doomsday is Upon Us?
Since 2013, NASA has been able to identify approximately 700 near-Earth objects, each posing a potential threat to our planet. Out of those 700 neat-Earth objects at least ten asteroids have been classified as “extremely dangerous” based on their size and orbital paths, all thanks to the WISE Spacecraft.
In every year or two, many previously unknown asteroids and comets whizz past Earth. In 2012, one of these asteroids came too close to the Earth passing by at a distance of just 14,440 kilometers. On Earth, the distance might be far enough, but on a cosmic scale that’s pretty close.
But it is not just the asteroids and comet impacts that can erase life from the Earth, humans themselves play an important role in this. In a study conducted in 2014, the researchers found out that the extinction rate of species is now 1000x greater than before humans came into existence.
In short, we have all the evidences from the past and all the data from the present, what’s renaming now is the impending future. Although, we cannot see what’s in there for us in the future, doesn’t mean that we cannot be prepared for it. Now, we can act to stop the climate change, we can put a new asteroid-tracking system in place which can alarm us months before any impending encounter with asteroid or comet. And most importantly, develop a reliable means to deflect any extraterrestrial ‘thing’ that is on a collision course with our planet.
But again, the calamity we might face in the future are so unpredictable in nature that most of our defenses might just fail. What we need here is a backup plan. A backup plan that can help humanity to repopulate and flourish themselves after the final apocalypse.
Making copies of terrestrial life aren’t just a proposition as one might think, but actual work has been done in that area too. It all started in the late 1970s, when scientists around the world started to store endangered plant seeds. Today, there are dozens of these seed banks operational around the world.
The most famous one is the Svalbard Global Seed Vault, situated on a distant Norwegian island about 1,300 kilometers from the North Pole. The location of the vault is ideal for long-term cold and dry storage. But recent reports have raised some speculations over this fail-safe vault ability to withstand any global disaster and ensure humanity’s food supply forever.
Svalbard Global Seed Vault
Like seeds, biological material from animals are also stored in some places, though they are less common. Here, they store animal embryos, eggs, sperm and DNA’s of endangered animals. With modern techniques, sperm, eggs and embryos can be kept frozen for nearly 20 years without losing its potency.
We are making great progress in finding new ways to extract genome data from animals and plants, but the real question here is where should we store the backups? Backing up tons of life saving data on Earth seems a high-risk strategy and the Svalbard Global Seed Vault is the best example of that. So, given that the main purpose of making a backup of life is to preserve humanity, it is evident that our Earth is not the best place to keep the backups as it’s waiting for a catastrophe.
Then perhaps the most obvious place to keep the backups is in space. For a start, scientists are already taking seeds into space for a short period of time (six months) to test their ability back on Earth. Originally, the space is a harsh environment for biological material, where they can get exposed to strong radiation that will damage their DNA, although, low Earth orbit can be a suitable place for seeds as Earth’s magnetic field will provide protection from space radiation in some degree.
Other possible locations in space for storage of biological data is the Moon, and the moons of Saturn and Jupiter or maybe a futuristic space craft itself. Such projects have been proposed and groups around the world have begun planning such ventures.
No matter how, life on Earth is going to die sooner or later. The question is will we able to preserve the humanity? That is one question we are all trying to answer.