4 ms·
a few more details are at https://www.nasa.gov/aeroresearch/programs/iasp/sfd https://www.nasa.gov/aeroresearch/programs/iasp/sfd
by chrispeel 4y ago
a few more details are at https://www.nasa.gov/aeroresearch/programs/iasp/sfd https://www.nasa.gov/aeroresearch/programs/iasp/sfd