Find swirl stock images in hd and millions of other royaltyfree stock photos, illustrations, and vectors in the shutterstock collection. thousands of new, highquality pictures added every day.Dark matter is hypothetical form of matter that is thought to account for approximately % of the matter in the universe, and about quarter of its total energy density.the majority of dark matter is thought to be nonbaryonic in nature, possibly being composed of some asyet undiscovered subatomic particles.its presence is implied in variety of astrophysical observations, including . As followup to my controversial post on the effect of infrared back radiation downwelling from the colder sky to the warmer surface, the existence of which some dispute (despite the realtime availability of such data), ive come up with an experimental setup to see how ir radiation from the sky influences air temperature near the ground. Newton’law of universal gravitation states that every particle attracts every other particle in the universe with force which is directly proportional to the product of their masses and inversely proportional to the square of the distance between their centers. this is general physical law derived from empirical observations by what isaac newton called inductive reasoning.