Tag Archives: life forms

Instead of finding alien life, should we be hiding from it?

A recent study suggests a method for hiding from aliens. This study, published in the Monthly Notices of the Royal Astronomical Society, comes at a time when most papers and study are related to how to find alien life.

A great deal of our quest for Earth-like planets depends on transiting planets. Transiting planets travel in front of their host star in a manner in which the transit can be seen from our viewpoint. The travel of the planet in front of the host star makes the light from that star diminish or glimmer, and we can utilize that to determine a wide range of information about far off planets — including how sustainable they might be for life.

Should we hide from the aliens? Graphic from Andreas Rocha
Should we hide from the aliens? Graphic from Andreas Rocha

A few scientists have proposed that we ought to hope that Earth is a transiting planet from the viewpoint of another planet that contains intelligent life. At the end of the day, our best endeavor for discovering alien life may be trusting that aliens are utilizing similar techniques of planetary detection that we are, and that the movement of Earth in front of the sun is visible with their telescopes.

Graduate student Alex Teachey and Professor David Kipping, both from Columbia University in the City of New York, attempted to figure out how much laser light would be required to cover the diminishing or glimmering light brought about by the transit of Earth.

As indicated by their calculations, it would take about 10 constant hours of shining a 30 MW laser once every year to shield the transit signal in discernible light. Reproducing each wavelength of light released by the sun would require around 250 MW of power.

Teachey said in a statement that “Alternatively, we could cloak only the atmospheric signatures associated with biological activity, such as oxygen, which is achievable with a peak laser power of just 160 kW per transit. To another civilization, this should make the Earth appear as if life never took hold on our world.”

There’s still a major, interdisciplinary deliberation about whether we should try to contact alien life from other planets. This study will become one of many that detail whether or not we should be hiding from alien life, instead of if we should find it and try to communicate with them.