#OTD 18 March 1965, Alexei Leonov is 1st person to exit their spacecraft in orbit, paving way for generations of spacewalkers. More history of #EVAs here (note, since published in 2016, @astro_timpeake & @Thom_astro both made spacewalks, Thomas made 2): https://t.co/CCuwAVRRNo pic.twitter.com/Cve6KR7vM5

— ESA space history (@ESA_History) March 18, 2018