Solid core nuclear reactors have been fueled by compounds of uranium that exist in solid phase under the conditions encountered and undergo nuclear fission to release energy. Flight reactors must be lightweight and capable of tolerating extremely high temperatures, as the only coolant available is the working fluid/propellant. A nuclear solid core engine is the simplest design to …

The overview effect is a cognitive shift reported by some astronauts while viewing the Earth from space. Researchers have characterized the effect as "a state of awe with self-transcendent qualities, precipitated by a particularly striking visual stimulus". The most prominent common aspects of personally experiencing the Earth from space are appreciation and perception of …

An uncrewed Block 1B is planned to launch the Lunar Surface Asset in 2028, the first lunar outpost of the Artemis program. [citation needed] Budget. For fiscal years 2011 through 2022, the SLS program had expended funding totaling $23.809 billion in nominal dollars. This is equivalent to $27.491 billion in 2022 dollars using the NASA New Start ...

Three-phase electric power (abbreviated 3φ) is a common type of alternating current used in electricity generation, transmission, and distribution. It is a type of polyphase system employing three wires (or four including an optional neutral return wire) and is the most common method used by electrical grids worldwide to transfer power.. Three-phase electrical power was …

The 16th-century church clock at Arnemuiden indicates the lunar phase and the time of high tide. Franeker. The Eise Eisinga Planetarium, built 1774–1781, is an orrery and astronomical clock which shows the movements of the solar system. Arnemuiden clock showing high and low water (hoog and laag)

Lunar distance. The term lunatic was sometimes used to describe those who sought to discover a reliable method of determining longitude (before John Harrison developed the marine chronometer method of determining longitude, the main theory was the Method of Lunar Distances, advanced by Astronomer Royal Nevil Maskelyne).

The Raven was not released in the US; instead a compilation album The Stranglers IV was released in 1980, containing a selection of tracks from The Raven and a mix of earlier and later non-album tracks. The Raven sold well, reaching No.4 in the UK Albums Chart - it spawned one top 20 single, "Duchess", with "Nuclear Device" reaching No.36 and the EP "Don't Bring Harry" …

Les cratères lunaires ont reçu différentes interprétations au cours des siècles : récif corallien, anneaux de glace selon la doctrine de la glace éternelle d'Hans Hörbiger, cyclones [2], trous creusés par les sélénites selon Johannes Kepler, volcanisme selon l’Astronomie populaire de François Arago ou Camille Flammarion [3].. La nomenclature est celle établie à partir de 1935 ...

The Lunar Reconnaissance Orbiter (LRO) is a NASA robotic spacecraft currently orbiting the Moon in an eccentric polar mapping orbit. Data collected by LRO have been described as essential for planning NASA's future human and robotic missions to the Moon. Its detailed mapping program is identifying safe landing sites, locating potential resources on the Moon, …

The night sky is the nighttime appearance of celestial objects like stars, planets, and the Moon, which are visible in a clear sky between sunset and sunrise, when the Sun is below the horizon.. Natural light sources in a night sky include moonlight, starlight, and airglow, depending on location and timing. Aurorae light up the skies above the polar circles.

Natural hazards such as earthquakes, floods, volcanoes and tsunami have threatened people, society, the natural environment, and the built environment, particularly more vulnerable people, throughout history, and in some cases, on a day-to-day basis.According to the Red Cross, each year 130,000 people are killed, 90,000 are injured and 140 million are affected by unique …