Because particles originate from a variety of mobile and stationary sources (diesel trucks, woodstoves, power plants, etc.), their chemical and physical compositions vary widely.

The theorists who predicted that such ghostlike particles probably originate in nuclear reactions in the Sun and in exploding stars despaired of ever discovering their traces.

The particles in the radiation belts originate in the outer magnetosphere and are adiabatically accelerated, when they are transported to the inner magnetosphere.

The charged particles originate in the magnetosphere and solar wind and, on Earth, are directed by the Earth's magnetic field into the atmosphere.

Larger particles usually originate from material aspired into the cloud.

An interpolation scheme is then utilized to estimate the value of the dependent variable at the grid points surrounding the point where the particle originated from.

While at Cornell, he concluded that these particles originated in cosmic cataclysms like exploding stars and even exploding galaxies.

Hot particles released into the environment may originate in nuclear reactors.

Detection of the particle tracks can allow computers to reconstruct where the particle originated, and thus figure out where each of their parent particles has decayed.

Scientists have assumed that the cosmic particles must originate nearby, because they would lose their high energy on significantly longer journeys.