They finally came to take her home.

I guess the alien invasion is old news by now, isn’t it? Yet in all these years, no one has been able to provide substantiated evidence of any extraterrestrial visitation. Sure, we’ve all met people who seem to be from another planet. My friend NC is a prime example. But the authorities reject all of my claims of her being of alien origin.

Nor are they convinced by all of the eyewitness accounts or by the numerous videos on YouTube. I’ve personally watched footage of an alien autopsy dating back to a 1947 UFO crash in Roswell, New Mexico, and watched an interview with an alien filmed inside Area 51 in Nevada. But then again, I’ve also watched the videos that debunk these claims.

So now I’m confused. Have the aliens invaded or not? Is it a series of hoaxes fabricated by people wanting publicity? Or perhaps a massive cover up by the government?

Do Aliens Exist?

Before we can discuss the likelihood of aliens visiting Earth, we should establish whether or not they even exist. For a planet to sustain life, it must reside in what scientists call the Goldilocks Zone. In other words, it has to be just the right distance from a star so that it’s not too hot and not too cold. Too hot and water vaporizes. Too cold and water turns to ice. Since life requires liquid water to survive, Earth is the only planet in our solar system capable of sustaining life (unless of course you classify bacteria as life).

But that’s just our solar system. The universe is pretty vast with lots of other planets orbiting their own stars. In our galaxy alone, scientists estimate that there are at least 50 billion planets. Out of those, over 11 billion are potentially Goldilocks planets.

Hence, to paraphrase Carl Sagan and Stephen Hawking, it would be improbable for life not to exist somewhere other than Earth.

Have Aliens Visited Earth?

I think we can safely say that we’re not alone in the universe. But have any of these neighbors stopped by for a visit?

Currently, the closest known Goldilocks planet is Proxima b. When looking at the vastness of the universe, Proxima b is relatively close, a mere 25 trillion miles away. That’s 4.2 light years (a measurement of distance, not time). In other words, it would take light 4.2 years to travel from Earth to Proxima b. Unfortunately, due to the stellar wind pressures (more than 2,000 times those experienced by Earth) scientists doubt there is life on Proxima b.

The next closest Goldilocks planets (three of them) orbit the red dwarf star Wolf 1061, which is just 82 trillion miles away, or 14 light years.

Light travels at 186,282 miles per second (670 million miles per hour). It could circle the Earth 7.5 times in one second. Light travels from the Earth to the moon in 1.3 seconds; however, it takes our spacecrafts over four days to travel the same distance. Voyager 1 travels about 38 thousand miles per hour (.0005 the speed of light). At that speed, it would take 156,000 years to reach Wolf 1061.

Granted, there could be alien civilizations that are far more advanced than ours, but can they travel at the speed of light? It seems improbable. How about wormholes? That would certainly cut down on the amount of time it takes to traverse the universe.

There is no observational evidence for wormholes, but in his theory of general relativity, Einstein hypothesizes that they might exist. However, they would be minuscule and too unstable to allow a craft to pass through.

To me, the evidence doesn’t bode well for aliens visiting Earth. What are your thoughts?