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 ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Dooblydoo thanks go to the following Patreon supporters: Kevin Bealer, Mark Terrio-Cameron, KatieMarie Magnone, Patrick Merrithew, D.A. Noe, Charles Southerland, Fatima Iqbal, Sultan Alkhulaifi, Nicholas Smith, Tim Curwick, Alexander Wadsworth, Scott Satovsky Jr, Philippe von Bergen, Bella Nash, Chris Peters, Patrick D. Ashmore, Piya Shedden, Charles George ---------- Like SciShow? Want to help support us, and also get things to put on your walls, cover your torso and hold your liquids? Check out our awesome products over at DFTBA Records: http://dftba.com/scishow ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- 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 ______ 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