title: Why we need space travel.
authors.affiliation: Institute for Advanced Study of Pavia (IUSS), Lungo Ticino Sforza 56, 27100 Pavia, Italy; Accademia dei Lincei, Rome, Italy. Space Science Advisory giovanni.bignami@gmail.com.
authors.forename: Giovanni
authors.initials: G
authors.lastname: Bignami
mesh_terms: D018480:Astronauts / Q000266:history / Q000639:trends*; D005060:Europe; D049673:History, 20th Century; D049674:History, 21st Century; D011057:Politics; D013026:Space Flight / Q000191:economics / Q000266:history / Q000639:trends*; D014481:United States; D018557:United States National Aeronautics and Space Administration / Q000191:economics / Q000266:history