tektites are gravel-sized bodies composed of black, green, brown, or gray

alien are asteroid astronomy authentic background black bodies bolide brown comet composed cosmic cosmology cosmos crust debris earth ejected explosion extraterrestrial falling formed fragment fusion geology glass gravelsized gray green impact impacts iron isolated macro metallic meteor meteorite meteorites meteoroid mineral mineralogy natural nickel outer pattern piece planet planetesimals rock rocks rust science shooting silica silicone solar space star stone system tektite tektites terrestrial texture treasure universe