Gravitational microlensing events are revealing the mysteries of rogue planets, but what are they, and how does it work? And what role does the Nancy Grace Roman Space Telescope play in helping us spot more rogue planets in the future? Astrum merch now available! Apparel: https://teespring.com/stores/astrum-space Metal Posters: https://displate.com/promo/astrum?art=5f04759ac338b SUBSCRIBE for more videos about our other planets. Subscribe! http://goo.gl/WX4iMN Facebook! http://goo.gl/uaOlWW Twitter! http://goo.gl/VCfejs Astrum Spanish: https://bit.ly/2KmkssR Astrum Portuguese: https://www.youtube.com/channel/UChn_-OwvV63mr1yeUGvH-BQ Donate! Patreon: http://goo.gl/GGA5xT Ethereum Wallet: 0x5F8cf793962ae8Df4Cba017E7A6159a104744038 Become a Patron today and support my channel! Donate link above. I can't do it without you. Thanks to those who have supported so far! Image Credits: NASA/ESA/ESO Music Credits: Adrian Chifu - Eternal Traveller