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from article Meteor

Leonid meteor shower observed at the Modra Astronomical Observatory in Slovakia through a fisheye lens. The exposure on November 16–17, 1998, lasted 4 h. About 150 bolides brighter than magnitude −2 can be seen; the brightest fireball is about…

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from article Air armament

Air Superiority Missile Concept.

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from article Air armament

Low-Cost Autonomous Attack System (LOCAAS; formerly Low-Cost Antiarmor Submunition). (a) Autonomous submunition, with length of 30 in. (0.75 m), wingspan of 40 in. (1.0 m), and weight of 90–100 lb (40–45 kg). (b) Various warhead modes.

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from article Ursa Major

Modern boundaries of the constellation Ursa Major, the Great Bear. The celestial equator is 0° of declination, which corresponds to celestial latitude. Right ascension corresponds to celestial longitude, with each hour of right ascension…

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from article X-ray telescope

Wolter type I x-ray telescope, in this case the Chandra X-ray Observatory. Two surfaces of revolution (paraboloid and hyperboloid) reflect the incident x-rays to a common focus. The horizontal scale is greatly compressed. (Chandra X-ray Center)

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from article X-ray telescope

A composite image of the Sun using the Solar Dynamics Observatory (SDO). The x-rays are shown in three colors: red (21.1 nm), green (19.3 nm), and blue (17.1 nm). (Lockheed Martin Solar and Astrophysics Laboratory, Smithsonian Astrophysical…

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from article X-ray telescope

Schematic of a microcalorimeter. An absorber is kept very cold. Then when an x-ray hits, the temperature change is measured. From this, the energy of the x-ray can be computed. (NASA)

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from article Rocket astronomy