Astronomers William P. Bidelman and Fred Hess said it undoubtedly was a meteor bolide. For geologists, a bolide is a meteorite large enough to create an impact crater. A bolide is a large meteoroid, explosively torn apart as it hits the atmosphere. Astronomers often use "bolide" to identify an exceptionally bright fireball, particularly one that explodes. If the bolide is large enough, fragments may survive such as the Chelyabinsk meteorite. Bolide impacts can be dramatic triggers of mass extinctions. In geology, a bolide is a very large impactor. If the bolide struck the Laurentide ice sheet as hypothesized by Firestone et al. Geologists use the term "bolide" in a somewhat different context than astronomers do. These modifications remove the need for the brake fairings which are seen on the Bolide. Their evidence and counter-evidence is discussed in the article Tollmann's hypothetical bolide. Each battery also has four RBS 70 MANPADS launchers with Bolide missiles. The event was probably caused by a bolide. The bolide that created the Sudbury Basin could have been even larger. The bolide was so bright that witnesses were seeing spots afterward.