Here's a simulation, by Kevin R. Grazier at JPL, which claims that large outer planets, rather than shielding inner planets from debris, help life-bearing condi

Here's a simulation, by Kevin R. Grazier at JPL, which claims that large outer planets, rather than shielding inner planets from debris, help life-bearing conditions by kicking ice-bearing comets inward. Blurb on phys.org: https://phys.org/news/2016-02-jupiter-role-planetary-shield-earth.html https://phys.org/news/2016-02-jupiter-role-planetary-shield-... Abstract with paywalled paper ($51!) https://www.liebertpub.com/doi/abs/10.1089/ast.2015.1321?journalCode=ast https://www.liebertpub.com/doi/abs/10.1089/ast.2015.1321?jou... Non-paywalled article found (Italian site, looks legit?) https://www.media.inaf.it/wp-content/uploads/2016/02/ast2E20152E1321.pdf https://www.media.inaf.it/wp-content/uploads/2016/02/ast2E20...