Get Regular Updates!
Search

Space

image|

Chenoa Tremblay/ ICRAR-Curtin

Snatching at the cradle of life

Snatching at the cradle of life

Silence of the WA outback key in detecting low-frequency radio waves and, maybe, the precursors of life itself.

Snatching at the cradle of life

The hunt for extraterrestrial life might not look like you would expect.

Rather than fully formed, many-limbed, slime-covered humanoid beings, scientists at the International Centre for Radio Astronomy Research (ICRAR) are detecting much tinier things.

They’re detecting molecules only a few atoms large that might be the precursors to life.

And they’re detecting them in stars 28,000 light years away.

It might sound like an impossible task. However, the extreme isolation of our West Aussie outback is allowing ICRAR scientists to get the job done, utilising incredible radio telescope technology.

RADIO STAR

The sheer lack of humanity in our outback means that there’s very little electromagnetic interference. The air-swamp of invisible signals from TVs, mobiles and radio towers doesn’t exist here.

View Larger
Image|WA Department of Commerce
A lack of radio noise in the outback makes it an ideal spot for researchers to study space

Which makes areas like the Shire of Murchison a perfect spot to set up 2048 antennas that detect low-frequency radiation from space.

Astrochemist Chenoa Tremblay utilised the Murchison Widefield Array to analyse molecules in stars, gas and dust 28,000 light years from Earth.

But what was she actually looking at?

SPACE PRINTS

Molecules are made of a few or more atoms. Each of these atoms contains electrons that can jump between high and low energy states.

As they do so, they absorb or emit energy. In space, this energy is a photon—a little parcel of light.

Each molecule is made of a specific number and variety of atoms, thus each molecule can absorb and spit out photons in different, recognisable patterns. Scientists call these molecular signatures or fingerprints.

One print in particular piqued Chenoa’s interest. It was a pattern of photons that suggested she had detected nitric oxide, a tiny molecule that has only ever been detected in a star one other time.

For such a small molecule, it has some big implications.

THE CURIOUS CASE OF COMPLEX MOLECULES

Life (as we know it) requires proteins, and proteins are made from amino acids.

And we know that complex amino acids exist in space. Many different types have been found in comets and meteors.

View Larger
Image|ESA / MPS / OSIRIS Team / Kevin M. Gill
The Rosetta spacecraft detected the amino acid glycine on the Churyumov–Gerasimenko comet

But amino acids have never been spotted in stars or galaxies.

So where are they? Where are they coming from? How are they forming?

Finding nitric oxide might give us a clue. We know that nitric oxide (NO) is made in the formation of amino acids.

If we can track down more NO, can we find these more complex molecules that are required for life?

That’s what astrochemists are asking. And hopefully, low-frequency telescopes can help illuminate an answer.

BLOW IT WIDE OPEN

Most regular telescopes look up to the sky, and they might see a single star. Or a few stars. And so scientists have to point the telescopes across multiples places.

But the Murchison Widefield Array (as the name suggests) can see a whole lot more of the sky at once.

Chenoa says, “If you think of looking up and seeing the size of a full Moon, my survey covers the area of 1600 Moons.”

In fact, Chenoa’s study was the widest field-of-view molecular survey of the Milky Way ever published.

Which means a whole lot more stars that we can go snooping on all at once.

STARS IN HER EYES

Chenoa’s study was really a trial run, an attempt to answer a lot of questions. How feasible are low-frequency telescopes? What new things can we learn from them? And how can we survey the skies better?

Her answers to these questions will help inform the final design of the Square Kilometre Array (SKA) low-frequency array. This massive project will place WA at the forefront of radio astronomy.

View Larger
Image|NASA/JPL-Caltech
The Orion Nebula is a particularly well studied stretch of space

But there are some more tests to get through before that’s up and running.

For her next project, Chenoa is turning her gaze towards the Orion constellation, a familiar figure in our skies and a frequent subject of radio astronomy studies. Hopefully, this astronomical huntsman will help us chase down more molecules and some answers to our questions.

Vital science VIDEO

Republish

Creative Commons Logo

Republishing our content

We want our stories to be shared and seen by as many people as possible.

Therefore, unless it says otherwise, copyright on the stories on Particle belongs to Scitech and they are published under a Creative Commons Attribution-NoDerivatives 4.0 International License.

This allows you to republish our articles online or in print for free. You just need to credit us and link to us, and you can’t edit our material or sell it separately.

Using the ‘republish’ button on our website is the easiest way to meet our guidelines.

Guidelines

You cannot edit the article.

When republishing, you have to credit our authors, ideally in the byline. You have to credit Particle with a link back to the original publication on Particle.

If you’re republishing online, you must use our pageview counter, link to us and include links from our story. Our page view counter is a small pixel-ping (invisible to the eye) that allows us to know when our content is republished. It’s a condition of our guidelines that you include our counter. If you use the ‘republish’ then you’ll capture our page counter.

If you’re republishing in print, please email us to let us so we know about it (we get very proud to see our work republished) and you must include the Particle logo next to the credits. Download logo here.

If you wish to republish all our stories, please contact us directly to discuss this opportunity.

Images

Most of the images used on Particle are copyright of the photographer who made them.

It is your responsibility to confirm that you’re licensed to republish images in our articles.

Video

All Particle videos can be accessed through YouTube under the Standard YouTube Licence.

The Standard YouTube licence

  1. This licence is ‘All Rights Reserved’, granting provisions for YouTube to display the content, and YouTube’s visitors to stream the content. This means that the content may be streamed from YouTube but specifically forbids downloading, adaptation, and redistribution, except where otherwise licensed. When uploading your content to YouTube it will automatically use the Standard YouTube licence. You can check this by clicking on Advanced Settings and looking at the dropdown box ‘License and rights ownership’.
  2. When a user is uploading a video he has license options that he can choose from. The first option is “standard YouTube License” which means that you grant the broadcasting rights to YouTube. This essentially means that your video can only be accessed from YouTube for watching purpose and cannot be reproduced or distributed in any other form without your consent.

Contact

For more information about using our content, email us: particle@scitech.org.au

Copy this HTML into your CMS
Press Ctrl+C to copy

We've got chemistry. Want something physical?