Home SpaceWhat Alien Worlds Actually See When They View Earth From Lightyears Away
SpaceBy Joe Burgett -

What Alien Worlds Actually See When They View Earth From Lightyears Away
[Image via NASA]

Cosmos Redshift 7

  • Distance From Earth: 12.9 Billion Lightyears
  • Number Of Stars: Unknown 

The Cosmos Redshift 7 Galaxy is one of the oldest galaxies astronomers have ever discovered. It is believed to have formed roughly 800 million years after the Big Bang took place. While it randomly got its name from soccer legend Cristiano Ronaldo, the two do not really have anything in common except the number. CR7 is a high-redshift, Lyman-alpha emitter galaxy. In simple terms, this means it is a distant galaxy that emits Lyman-alpha radiation from neutral hydrogen. CR7 also increases the wavelength of electromagnetic radiation while reducing its frequency. All of this then combines with photon energy.

What would alien worlds see if they looked in our direction? While they might have advanced equipment that we could not fathom, if they did not get closer to us then they’d never know we existed. The Earth did not come about until just under 5 billion years ago. However, our entire solar system did not exist before that time roughly. If that is not enough for you, the entire Milky Way galaxy did not form until 14 billion years ago. Thus, CR7 worlds would be seeing a slowly forming galaxy that would not include us for over ten billion years!!

What Alien Worlds Actually See When They View Earth From Lightyears Away
[Image via Allexxandar/Shutterstock.com]

Butterfly Nebula

  • Distance From Earth: 3,000 to 6,000 Lightyears
  • Number Of Stars: 1

The Butterfly Nebula is technically within the Milky Way and not a galaxy unto itself. However, it almost seems like its own galaxy due to its appearance. Scientists claim it is the most complex planetary nebulae ever discovered. With only one central star, it has to emit extreme heat to allow for such beautiful light to be seen. It is estimated to be one of the hottest stars ever discovered, with a surface temperature of 250,000 degrees Celcius or 450,032 degrees Fahrenheit. The interesting part? The star is a White Dwarf! The Hubble Space Telescope discovered it in 2009, and scientists were blown away.

The possible alien worlds here are likely seeing a developed Earth being between 3,000 to 6,000 lightyears away. Societies had already formed, along with several languages on top of early writing. The Pyramid of Giza among other man-made structures from the old world was built in this period. While several periods such as the Bronze and Iron Age happened during this period, the planet itself did not change massively on a geological end. However, several animals popped up or went extinct in this timeframe. Mankind was also a bit smaller than it would go on to become.

 

Where do we find this Stuff? Here are our Sources:

National Aeronautics & Space Administration (NASA)

European Space Agency (ESA)

National Science Foundation (NSF)

Public Broadcasting Company (PBS)

Cornell University

University of California – Berkley

University of California – Riverside

Cambridge University

California Institute Of Technology

University of Hawaii

New York Times

Britannica

Slate

Live Science

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