In the last few decades, our astronomical techniques have developed to the point that we can now detect planets orbiting other stars. Planets which transit their star make up most of our catalogs, because they are so easy to find and can reveal so much more information about the planets. For example, in the near future we might even be able to detect life remotely on these worlds. This makes us wonder could someone out there already be using this method on us? Here, we explore which stars are best placed to detect us using the transit method, what they might learn about us and the possibility of reciprocal transit configurations, enabling a possible means of direct communication across the stars.

Written and Presented by Prof. David Kipping. All planet images/videos shown are artistic impressions and not real photographs, except for the pixelated image of TRAPPIST1 (see below)

This video is based on research conducted at the Cool Worlds Lab at Columbia University, New York. You can now support our research program directly here: https://www.coolworldslab.com/support

References:
► Rauscher, B. J. et al., 2016, "Detectors and cooling technology for direct spectroscopic biosignature characterization", JATIS, 2, 041212: https://www.spiedigitallibrary.org/jo...
► Burke, C. J., Mullally, F., Huber, D., 2018, "K2 Exoplanet Ecliptic Survey KEES": https://keplerscience.arc.nasa.gov/da...
► Kipping, D. & Teachey, A., 2016, "A Cloaking Device for Transiting Planets", MNRAS, 459, 1233

Video materials and graphics used:
► ESO animations credit to ESO and Herbert Zodet: https://www.eso.org/public/videos/eso...
► TRAPPIST1 pixels animation by NASA Ames/G. Barentsen: https://www.nasa.gov/imagefeature/am...
► Transit animation credit to NASA:    • Animation: Distant Exoplanet Transiti...  
► Kepler1625bi animation by NASA, ESA and L. Hustak: https://hubblesite.org/contents/news...
► Milky Way animation by Stefan PayneWardenaar: https://vimeo.com/330625918
► EarthSun orbit animation by Brad Freese:    • Earth Orbit  
► Breakthrough Starshot animation by the Breakthrough Foundation:    • Breakthrough Starshot Animation (Full)  
► Laser transit animation by National Geographic: https://www.nationalgeographic.com/ne...
► TESS animation courtesty of NASA/MIT:    • NASA’s New Planet Hunter: TESS  
► Solar activity timelapse credit the NASA/SDO: https://sdo.gsfc.nasa.gov/gallery/main

Outro music used, in chronological order:
► "Fusion" by Indive, "Halo Drive" EP, licensed under a Creative Commons Attribution license (https://creativecommons.org/licenses/...)

And also...
► Columbia University Department of Astronomy: http://www.astro.columbia.edu
► Cool Worlds Lab website: http://coolworlds.astro.columbia.edu

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