Spider - Description. 1  1: pedipalp 2: trichobothria 3: carapace of prosoma (cephalothorax) 2  15: sternum of prosoma 16: pedicel (also called pedicle) 3  Spiders are chelicerates and therefore arthropods. 4  Spiders and scorpions are members of one chelicerate group, the arachnids.
See also: Meteoroid and Meteor. A meteorite is a solid piece of debris from an object, such as a comet, asteroid, or meteoroid, that originates in outer space and survives its passage through the Earth's atmosphere and impact with the Earth's surface.
A meteoroid is a rock in space that has the potential to collide with the Earth's atmosphere. Meteoroids range in size from a speck of dust to a chunk about 100 meters in diameter, though most are smaller than a pebble. When a meteoroid enters the atmosphere, it becomes a meteor.