Five important things to know about the search for aliens

2015-08-03 21:17
Kepler 452b (Nasa)

Kepler 452b (Nasa)

Multimedia   ·   User Galleries   ·   News in Pictures Send us your pictures  ·  Send us your stories

Johannesburg - With the recent discovery of an earth-like planet, Kepler 452b, about 1 400 light years away, the recent pictures of Pluto, and the return of the Star Wars movies, the debate around space and the existence of extra-terrestrials is intensifying.

While the search for aliens continues through organisations such as Seti (Search for Extra Terrestrial Intelligence), most of the public gets their information on aliens from Hollywood and science-fiction novels.

Here are five important scientific things to know about the search for life in the universe:

1) According to scientists, a planet that can support life should be in a 'Goldilocks' region

In Goldilocks and the Three Bears, the blonde heroine (or burglar, if you want to think of her like that), attempts to eat porridge, sit in a chair and sleep in the bed of a family of the three Ursidae.

One porridge was too hot, one too cold and one just right. She also finds big chairs, small chairs, a hard bed and a soft bed, before finding ones that are just right.

Earth is in the "just right" position for life to exist. It is the right distance away from the sun - not too close for all our water to be boiled away, and not too far away for all of it to be frozen.

A distant planet that could have life, might just need to be the right distance away from its star.

While scientists put the existence of water high on the list for the possibility of alien life, a few acknowledge that these extra-terrestrial beings might not necessarily need water for life.

2) If they exist, they might not be little green men, but single-celled organisms - like bacteria

While a being with large eyes, saying "take me to your leader" looks fantastic in the movies, it will be exceedingly hard to try and communicate with aliens that are microscopic. 

This however, does not rule out the possibility that these potential beings won't exterminate life on our planet.

While larger aliens can blow up the White House and abduct human beings for probes, these little guys might just act like a virus when we interact with them - a virus our immune systems are not equipped to deal with.

3) An equation says aliens have to be out there somewhere

The universe is huge - so huge, in fact, that some estimates say there are more stars in the universe than grains of sand on Earth.

In 1961, American astronomer Frank Drake came up with an equation that determines the possibility of alien civilisations that could communicate through radio signals within our Milky Way galaxy.

This equation looks at the number of stars in the galaxy; the rate of star formation in the galaxy; the number of planets that could potentially support life; the fraction of planets with life that develop civilisations; and the fraction of civilisations that develop a technology that can give off signs to their existence and the length of time these civilisations release signals into space.

Drake, and the late famous astronomer and science writer/presenter Carl Sagan, determined that the Milky Way, which may have as many as 400 billion stars, has the potential for one million alien civilisations that could communicate through radio signals.

4) If the equation is correct, where is everyone?

Physicist Enrico Fermi once asked that if the universe was so big, why have we not yet made contact with extra-terrestrials.

Scientists put forth a lot of theories about why we have not heard from other alien civilisations and these theories include:

- Earth and humans are unique in the universe;

- Aliens could have visited the earth before humans were here;

- The universe is just too big, and signals could take millions of years to reach us;

- They are out there and are communicating with us, but our technology is too simple to pick up their messages;

- Some aliens are colonisers, so other alien civilisations have decided not to draw attention to themselves.

5) So, do aliens exist?

Given the size of the universe, the possibility of life besides that on Earth is high.

So the most scientific lay answer is... maybe.

Read more on:    space

Join the conversation!

24.com encourages commentary submitted via MyNews24. Contributions of 200 words or more will be considered for publication.

We reserve editorial discretion to decide what will be published.
Read our comments policy for guidelines on contributions.

24.com publishes all comments posted on articles provided that they adhere to our Comments Policy. Should you wish to report a comment for editorial review, please do so by clicking the 'Report Comment' button to the right of each comment.

Comment on this story
124 comments
Comments have been closed for this article.

Inside News24

 
PARTNER CONTENT
INFOGRAPHIC: New thinking required for retirement

Everything we believe about retirement is fast becoming outdated.

PARTNER CONTENT
WATCH: How education can change a life

A university education gives students the chance to create a better future for themselves, their families and to opportunity achieve their dreams.

/News

Book flights

Compare, Book, Fly

Traffic Alerts
There are new stories on the homepage. Click here to see them.
 
English
Afrikaans
isiZulu

Hello 

Create Profile

Creating your profile will enable you to submit photos and stories to get published on News24.


Please provide a username for your profile page:

This username must be unique, cannot be edited and will be used in the URL to your profile page across the entire 24.com network.

Settings

Location Settings

News24 allows you to edit the display of certain components based on a location. If you wish to personalise the page based on your preferences, please select a location for each component and click "Submit" in order for the changes to take affect.




Facebook Sign-In

Hi News addict,

Join the News24 Community to be involved in breaking the news.

Log in with Facebook to comment and personalise news, weather and listings.