Top
Skip to Content
LOGO(small) - Queen's University Belfast
  • Our facebook
  • Our x-twitter
  • Our instagram
LOGO(large) - Queen's University Belfast

School of

Mathematics and Physics

  • Home
  • Study
    • Undergraduate Maths
    • Undergraduate Physics
    • Postgraduate Taught
    • Postgraduate Research
    • International
    • Student Handbook
    • Scholarships
    • Visiting Students
    • Key Contacts
  • Research
    • Research Showcase
    • Outreach & Engagement
    • Research Culture and Seminars
    • Consultancy and Knowledge Transfer
    • Research Centres
    • Research News
    • Postgraduate Research
    • Facilities
    • Awards
  • International
  • Business / Careers
  • Discover
    • About the School
    • GEDI
    • Autism NI Education Impact Award Champion
    • Safe Harbour Scheme
    • Mental Health Ambassador Scheme
    • Outreach
    • Green Impact
  • Connect
    • Staff
    • Get in touch
  • News
    • News Archive
    • School of Mathematics and Physics Prize Giving 2023
    • School of Mathematics and Physics Prize Giving 2024
  • Events
    • Events Archive
    • Sir Harrie Massey Colloquia
  • Home
  • Study
    • Undergraduate Maths
    • Undergraduate Physics
    • Postgraduate Taught
    • Postgraduate Research
    • International
    • Student Handbook
    • Scholarships
    • Visiting Students
    • Key Contacts
  • Research
    • Research Showcase
    • Outreach & Engagement
    • Research Culture and Seminars
    • Consultancy and Knowledge Transfer
    • Research Centres
    • Research News
    • Postgraduate Research
    • Facilities
    • Awards
  • International
  • Business / Careers
  • Discover
    • About the School
    • GEDI
    • Autism NI Education Impact Award Champion
    • Safe Harbour Scheme
    • Mental Health Ambassador Scheme
    • Outreach
    • Green Impact
  • Connect
    • Staff
    • Get in touch
  • News
    • News Archive
    • School of Mathematics and Physics Prize Giving 2023
    • School of Mathematics and Physics Prize Giving 2024
  • Events
    • Events Archive
    • Sir Harrie Massey Colloquia
  • Our facebook
  • Our x-twitter
  • Our instagram
In This Section
  • Awards
  • Research
  • School Events
  • Media

  • Home
  • School of Mathematics and Physics
  • News
  • News Archive
  • Research

Research

QUEEN’S RESEARCH SHOWS HOW AN ALIEN OBSERVER MIGHT DETECT EARTH

8 September, 2017

A group of scientists from Queen’s University Belfast and the Max Planck Institute for Solar System Research in Germany have looked at how an alien observer might be able to detect Earth using our own methods.

They find that at least nine exoplanets are ideally placed to observe transits of Earth, in a new work published in the journal Monthly Notices of the Royal Astronomical Society.

Thanks to facilities and missions such as SuperWASP and Kepler, we have now discovered thousands of planets orbiting stars other than our Sun, worlds known as ‘exoplanets’. The vast majority of these are found when the planets cross in front of their host stars in what are known as ‘transits’, which allow astronomers to see light from the host star dim slightly at regular intervals every time the planet passes between us and the distant star.

In the new study, the authors reverse this concept and ask, “How would an alien observer see the Solar System?” They identified parts of the distant sky from where various planets in our Solar System could be seen to pass in front of the Sun – so-called ‘transit zones’ -- concluding that the terrestrial planets (Mercury, Venus, Earth, and Mars) are actually much more likely to be spotted than the more distant ‘Jovian’ planets (Jupiter, Saturn, Uranus, and Neptune), despite their much larger size.

”Larger planets would naturally block out more light as they pass in front of their star”, commented lead author Robert Wells, a PhD student at Queen’s University Belfast. ”However the more important factor is actually how close the planet is to its parent star – since the terrestrial planets are much closer to the Sun than the gas giants, they’ll be more likely to be seen in transit.”

To look for worlds where civilisations would have the best chance of spotting our Solar System, the astronomers looked for parts of the sky from which more than one planet could be seen crossing the face of the Sun. They found that three planets at most could be observed from anywhere outside of the Solar System, and that not all combinations of three planets are possible.

Katja Poppenhaeger, a co-author of the study, added: “We estimate that a randomly positioned observer would have roughly a 1 in 40 chance of observing at least one planet. The probability of detecting at least two planets would be about ten times lower, and to detect three would be a further ten times smaller than this.”

Of the thousands of known exoplanets, the team identified sixty-eight worlds where observers would see one or more of the planets in our Solar System transit the Sun. Nine of these planets are ideally placed to observe transits of Earth, although none of the worlds are deemed to be habitable.
In addition, the team estimate that there should be approximately ten (currently undiscovered) worlds which are favourably located to detect the Earth and are capable of sustaining life as we know it. To date however, no habitable planets have been discovered from which a civilisation could detect the Earth with our current level of technology.

The ongoing K2 mission of NASA’s Kepler spacecraft is to continue to hunt for exoplanets in different regions of the sky for a few months at a time. These regions are centred close to the plane of Earth’s orbit, which means that there are many target stars located in the transit zones of the Solar System planets. The team’s plans for future work include targeting these transit zones to search for exoplanets, hopefully finding some which could be habitable.

Share
Latest News
  • New method in search for sustainable cooling technology developed at Queen’s University Belfast
    15 November, 2023
  • Phonon jets above the critical current in nanoscale devices
    15 November, 2023
  • New Spin to an Old Conundrum: Measuring Surface Potential Faster (and better)!
    25 October, 2023
  • Astronomers reveal the largest cosmic explosion ever seen
    12 May, 2023
  • Review Article - Waves in Lower Solar Atmospheres
    23 January, 2023
News Archive
  • News Archive
  • Awards
  • Research
  • School Events
  • Media
QUB Logo
Contact Us

School of Mathematics and Physics

Main Physics Building
University Road
Belfast
BT7 1NN

GET DIRECTIONS

General School Enquiries:

E-mail: mp@qub.ac.uk

Telephone: +44 (0)28 9097 1386/5293

Quick Links

  • Home
  • Study
  • Careers
  • Research

 

© Queen's University Belfast 2024
  • Privacy and cookies
  • Website accessibility
  • Freedom of information
  • Modern slavery statement
  • Equality, Diversity and Inclusion
  • University Policies and Procedures
Information
  • Privacy and cookies
  • Website accessibility
  • Freedom of information
  • Modern slavery statement
  • Equality, Diversity and Inclusion
  • University Policies and Procedures

© Queen's University Belfast 2024

Manage cookies