Are We Alone?
The eternal question of the human race is are we alone? If we are, that’s scary, and if we are not, that’s scary as well. We have been intrigued by this idea for a long time.
The search for extra-terrestrial intelligence started just as our curiosity did. We use sophisticated scientific methods to detect a signal coming from life somewhere in the Galaxy. The active search started in the 1960s when radio astronomy was put to work. We started searching for something that might come from an intelligent alien civilization. For years we haven’t heard a thing except for the background hum of space. However, one day in 1977, a radio telescope in Ohio received an unusual signal and the signal fitted perfectly the profile of an alien transmission.
Could it be something else? Other explanations have been ruled out at that point. The received signal was too narrow to come from any other natural sources.
Scientists scanned the sky in the area of the constellation Sagittarius, where the signal was detected from. Later on, when technology improved, the more sensitive telescopes were looking for the same signal.
But despite several decades of desperate searching, the signal was received only once and it has never been heard again. It remains a mystery.
In 1961, astronomer Frank Drake estimated there should be approximately between 1,000 and 100,000,000 civilizations in the Universe. Scientists from all over the world have continually revised this figures, and today we have estimated that there could be between two and 50,000 civilizations.
Plan B for Human Civilization – Where Could we Live?
Exoplanets were first proposed as an idea in the 16th century by Galileo who realized the Sun was a star like any other star. Copernicus proved that our Solar System’s planets orbit around the Sun. It took us hundreds of years after these discoveries to develop sophisticated telescopes powerful enough to look for exoplanets similar to our own planet.
The first exoplanet was spotted in 1995 and later on thousands more have been discovered. Instruments that we have now are sensitive enough to detect planets that are similar to Earth.
If we had to have a plan B for the human race, we would need a planet similar to Earth for us to have any chance living there. The perfect home for us should have the right temperature and atmosphere and it should orbit around the right star. Even those planets who have a similar atmosphere and structure of our planet are not reliable B plan for the human race. It will take us a long time before we can even visit these places.
From what we know now, we may never find a suitable second home and the only thing we have left is taking care of the home we have now. We should think about global warming more seriously. We should stop destroying our environment, the only home we have and we should obviously forget about the plan B and focus on the home we already have.
The Moon is Moving Away From Us
According to the latest research, the Moon is moving away from us. Currently, it is around 18 times further away from the Earth than it was when it was formed 4.5 billion years ago.
Without the Moon, our planet Earth would be unrecognizable, the oceans and seas around planet Earth would barely have any tides, the days would have a different length and we might not even be here. According to some scientists, the Moon was critical for starting life on Earth.
Should we be worried? The right answer is not yet. In our lifetime, the changes will be too small for anyone to notice a difference and detect the impact. The Moon will never stop orbiting the Earth. What will be critical for us is the Sun which keeps expanding and at one point it will become a red giant which will swallow both the Earth and the Moon. How much time do we have left? We have about five billion years to figure out what our escape plan will be. Basically, we have five billion years to think about plan B for the human race.