The long barrow was built on land previously inhabited in the Mesolithic period. It consisted of a sub-rectangular earthen tumulus, estimated to have been 15 metres (50 feet) in length, with a chamber built from sarsen megaliths on its eastern end.

Physical space is often conceived in three linear dimensions, although modern physicists usually consider it, with time, to be part of a boundless four-dimensional continuum known as spacetime he concept of space is considered to be of fundamental.

Equilibrates with the gases dissolved in the pulmonary capillary blood, and thus throughout the body. Thus, in precise usage, the words breathing.

For athletes, high altitude produces two contradictory effects on perfor the reduction in atmospheric pressure means there is less resistance from the atmosphere and the athlete's erformance.

In the eighteenth century the German philosopher Immanuel Kant developed a theory of knowledge in which knowledge about space can be both a priori and synthetic. According to that statements about space.

Maxwell's equations—the foundation of classical electromagnetism—describe light as a wave that moves with a characteristic velocity.