Now, this is the first answer by a new user of this site. Shouldn't we
give newcomers a bit more time to improve their answer before it's
Not in this case, where the answer took a few seconds to write, and there's no content in it worth preserving that wouldn't be easy enough to reproduce (literally just: "yes, they will be it says on the nasa site"), if its author wants to start again. Note that the contributor in question isn't even registered with the site and contribution shows no regard for quality, so there's not much chance that will occur. I wouldn't mind being pleasantly surprised, but it does look like a flyby post (no pun intended).
So, depending on your site privileges, down-vote, flag as low quality or not an answer, vote to delete, add a custom comment or select one that applies from templates in the low quality review queue, and once a moderator sees it, if that doesn't happen before by community vote, it will be deleted. Note that such flags are now suppressed in moderator queue so the community has the time to react without moderator's intervention.
Additionally, if you notice that some questions attract many low quality (or even spam and spam seeds) and subsequently deleted contributions, please raise a custom flag with request that the question is protected to prevent future low quality answers. And high reputation members (3,500 points on beta sites) can protect questions themselves without moderator's intervention.