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Would Aliens Be Able to See Earth?

Scientists have worked out how likely it is that distant planets can see earth, and we are learning new ways to study the magnetic fields of galaxies.

Host: Hank Green
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Sources:
https://academic.oup.com/mnras/article-abstract/doi/10.1093/mnras/stx2077/4082231/Transit-Visibility-Zones-of-the-Solar-System
https://exoplanets.nasa.gov/interactable/11/
http://exoplanet.eu/catalog/
http://adsabs.harvard.edu/doi/10.1086/166608
http://www.nature.com/nature/journal/v355/n6356/abs/355145a0.html
https://futurism.com/the-first-exoplanet-was-discovered-25-years-ago-today/
https://www.nature.com/articles/s41550-017-0218-x
https://www.cfa.harvard.edu/~mengsu/My_Research/Entries/2011/5/1_Galactic_Magnetic_Field.html
http://www.scholarpedia.org/article/Galactic_magnetic_fields
https://www.nature.com/nature/journal/v362/n6421/abs/362610a0.html
https://arxiv.org/pdf/1604.00028.pdf
https://arxiv.org/pdf/1302.5663.pdf
https://arxiv.org/abs/1605.09371
http://iopscience.iop.org/article/10.1088/0004-637X/706/1/L155/meta
http://www.wolframalpha.com/input/?i=redshift+z%3D1.019&rawformassumption=%22FSelect%22+-%3E+%7B%7B%22LookbackTimeFromRedshift%22%7D%7D
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Images:
https://www.nasa.gov/image-feature/cassini-earth-and-saturn-the-day-earth-smiled
https://exoplanets.nasa.gov/interactable/11/
https://www.nasa.gov/content/satellite-view-of-the-americas-on-earth-day
https://www.nasa.gov/content/satellite-view-of-the-americas-on-earth-day
https://www.nasa.gov/image-feature/goddard/2017/hubble-displays-a-dwarf-spiral-galaxy
https://www.nasa.gov/image-feature/jpl/spitzer/hubble/pia19837/what-feeds-the-beast-in-a-galaxy-cluster
https://www.cosmos.esa.int/documents/387566/425793/2015_353GHz_B-field/6965c458-b93b-4d08-8395-899157011727?t=1423086190400

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