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Artist impression of TDRS-L, the 11th member of NASA's Tracking and Data Relay Satellite System, orbiting Earth at 36,000 km (22,300 mi). TDRS-L sends signals, information, and commands from ground controllers to the International Space Station and…

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from article Communications satellite

Communications to and from a satellite.

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from article Communications satellite

Typical communications satellite. TWTA = traveling-wave–tube amplifier. (Credit: Space Systems/Loral)

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from article Communications satellite

Orbit periods of circular orbits.

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from article Polymer composite

Relation between stiffness and filler type and orientation in polymeric materials. L/D = length/diameter of fiber.

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from article Polymer composite

Load transfer from matrix to fiber in a composite. LC = critical length. σma = matrix stress.

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from article Polymer composite

Tensile modulus for various fibers.

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from article Polymer composite

Unidirectional continuous fiber–reinforced laminated structure. L = longitudinal direction. T = transverse direction.

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from article Polymer composite

Measured and predicted elastic modulus in a unidirectional fiber–reinforced laminate as a function of angle between the loading and fiber direction.

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from article Vampyromorpha

Vampyroteuthis infernalis (vampire squid) living in the oxygen-minimum zone of Monterey Bay, California, at depths of 600–900 m (1970–2950 ft). (Photo courtesy of Kim Reisenbichler, Monterey Bay Aquarium Research Institute, Moss Landing, CA)