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Deep Space Network
The NASA Deep Space Network (DSN) is a worldwide Telecommunications network, network of spacecraft communication ground segment facilities, located in the United States (California), Spain (Madrid), and Australia (Canberra), that supports NASA's interplanetary spaceflight, interplanetary spacecraft missions. It also performs radio astronomy, radio and radar astronomy observations for the exploration of the Solar System and the universe, and supports selected Earth-orbiting missions. DSN is part of the NASA Jet Propulsion Laboratory (JPL). General information DSN currently consists of three deep-space communications facilities located such that a distant spacecraft is always in view of at least one station. They are: * the Goldstone Deep Space Communications Complex () about north of Barstow, California, Barstow, California. For details of Goldstone's contribution to the early days of space probe tracking, see Project Space Track (1957-1961), Project Space Track; * the Mad ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
50th Anniversary NASA Deep Space Network
5 (five) is a number, numeral (linguistics), numeral and numerical digit, digit. It is the natural number, and cardinal number, following 4 and preceding 6, and is a prime number. Humans, and many other animals, have 5 Digit (anatomy), digits on their Limb (anatomy), limbs. Mathematics 5 is a Fermat prime, a Mersenne prime exponent, as well as a Fibonacci number. 5 is the first congruent number, as well as the length of the hypotenuse of the smallest integer-sided right triangle, making part of the smallest Pythagorean triple (3, 4, 5). 5 is the first safe prime and the first good prime. 11 forms the first pair of sexy primes with 5. 5 is the second Fermat number, Fermat prime, of a total of five known Fermat primes. 5 is also the first of three known Wilson primes (5, 13, 563). Geometry A shape with five sides is called a pentagon. The pentagon is the first regular polygon that does not Tessellation, tile the Plane (geometry), plane with copies of itself. It is the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Radar Astronomy
Radar astronomy is a technique of observing nearby astronomical objects by reflecting radio waves or microwaves off target objects and analyzing their reflections. Radar astronomy differs from ''radio astronomy'' in that the latter is a passive observation (i.e., receiving only) and the former an active one (transmitting and receiving). Radar systems have been conducted for six decades applied to a wide range of Solar System studies. The radar transmission may either be pulsed or continuous. The strength of the radar return signal is radar#Radar range equation, proportional to the inverse fourth-power of the distance. Upgraded facilities, increased transceiver power, and improved apparatus have increased observational opportunities. Radar techniques provide information unavailable by other means, such as testing general relativity by observing Mercury (planet), Mercury and providing a refined value for the astronomical unit. Radar imaging, Radar images provide information about th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parabolic Reflector
A parabolic (or paraboloid or paraboloidal) reflector (or dish or mirror) is a Mirror, reflective surface used to collect or project energy such as light, sound, or radio waves. Its shape is part of a circular paraboloid, that is, the surface generated by a parabola revolving around its axis. The parabolic reflector transforms an incoming plane wave travelling along the axis into a spherical wave converging toward the focus. Conversely, a spherical wave generated by a point source placed in the focus (optics), focus is reflected into a plane wave propagating as a collimated beam along the axis. Parabolic reflectors are used to collect energy from a distant source (for example sound waves or incoming star light). Since the principles of Specular reflection, reflection are reversible, parabolic reflectors can also be used to collimate radiation from an isotropic source into a parallel beam (optics), beam. In optics, parabolic mirrors are used to gather light in reflecting telescop ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Space Probe
Uncrewed spacecraft or robotic spacecraft are spacecraft without people on board. Uncrewed spacecraft may have varying levels of autonomy from human input, such as remote control, or remote guidance. They may also be autonomous, in which they have a pre-programmed list of operations that will be executed unless otherwise instructed. A robotic spacecraft for scientific measurements is often called a space probe or space observatory. Many space missions are more suited to telerobotic rather than crewed operation, due to lower cost and risk factors. In addition, some planetary destinations such as Venus or the vicinity of Jupiter are too hostile for human survival, given current technology. Outer planets such as Saturn, Uranus, and Neptune are too distant to reach with current crewed spaceflight technology, so telerobotic probes are the only way to explore them. Telerobotics also allows exploration of regions that are vulnerable to contamination by Earth micro-organisms sinc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Discovery And Exploration Of The Solar System
Discovery and exploration of the Solar System is observation, visitation, and increase in knowledge and understanding of Earth's "cosmic neighborhood". This includes the Sun, Earth and the Moon, the major planets Mercury, Venus, Mars, Jupiter, Saturn, Uranus, and Neptune, their satellites, as well as smaller bodies including comets, asteroids, and dust. In ancient and medieval times, only objects visible to the naked eye—the Sun, the Moon, the five classical planets, and comets, along with phenomena now known to take place in Earth's atmosphere, like meteors and aurorae—were known. Ancient astronomers were able to make geometric observations with various instruments. The collection of precise observations in the early modern period and the invention of the telescope helped determine the overall structure of the Solar System. Telescopic observations resulted in the discovery of moons and rings around planets, and new planets, comets and the asteroids; the recognition of ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tidbinbilla Nature Reserve
Tidbinbilla Nature Reserve is a protected area, on the fringe of Namadgi National Park. Tidbinbilla is a short drive from the capital city of Australia, Canberra, in the Australian Capital Territory. The nature reserve consists of a large valley floor, the Tidbinbilla Mountain and the Gibraltar range. The sides of the valley are steep and relatively undisturbed. The lower slopes of the valley are partly cleared and have a significant history of Aboriginal and European use. Tidbinbilla Mountain is believed to have been used for Aboriginal initiation ceremonies. The word 'Tidbinbilla' is Aboriginal in origin and comes from the word ''Jedbinbilla'' – a place where boys become men. Known sites of Aboriginal significance at Tidbinbilla include the Birriagi Rock Shelter, which is the oldest Aboriginal site within the Australian Capital Territory. Bogong Rocks is a shelter where the oldest evidence of Aboriginal occupation was found at a bogong moth resting site. The nature rese ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Project Space Track (1957-1961)
Project Space Track was a research and development project of the US Air Force, to create a tracking system for all artificial satellites of the Earth and space probes, domestic and foreign. Project Space Track was started in 1957 at the Air Force Research Laboratory at Laurence G. Hanscom Field, now Hanscom Air Force Base, in Bedford, Massachusetts shortly after the launch of Sputnik I. Observations were obtained from some 150 sensors worldwide by 1960 and regular orbital predictions were issued to the sensors and interested parties. Space Track was the only organization that used observations from all types of sources: radar, optical, radio, and visual. All unclassified observations were shared with the Smithsonian Astrophysical Observatory. In 1961, the system was declared operational and assigned to the new 1st Aerospace Surveillance and Control Squadron until 1976, as part of NORAD's Space Detection and Tracking System (SPADATS). Establishment On 29 November 1957, short ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Persian Language
Persian ( ), also known by its endonym and exonym, endonym Farsi (, Fārsī ), is a Western Iranian languages, Western Iranian language belonging to the Iranian languages, Iranian branch of the Indo-Iranian languages, Indo-Iranian subdivision of the Indo-European languages. Persian is a pluricentric language predominantly spoken and used officially within Iran, Afghanistan, and Tajikistan in three mutual intelligibility, mutually intelligible standard language, standard varieties, respectively Iranian Persian (officially known as ''Persian''), Dari, Dari Persian (officially known as ''Dari'' since 1964), and Tajik language, Tajiki Persian (officially known as ''Tajik'' since 1999).Siddikzoda, S. "Tajik Language: Farsi or not Farsi?" in ''Media Insight Central Asia #27'', August 2002. It is also spoken natively in the Tajik variety by a significant population within Uzbekistan, as well as within other regions with a Persianate society, Persianate history in the cultural sphere o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tehran
Tehran (; , ''Tehrân'') is the capital and largest city of Iran. It is the capital of Tehran province, and the administrative center for Tehran County and its Central District (Tehran County), Central District. With a population of around 9.8 million in the city as of 2025, and 16.8 million in the metropolitan area, Tehran is the List of largest cities of Iran, most populous city in Iran and Western Asia, the Largest metropolitan areas of the Middle East, second-largest metropolitan area in the Middle East after Cairo, and the 24th most populous metropolitan area in the world. Greater Tehran includes several municipalities, including, Karaj, Eslamshahr, Shahriar, Tehran province, Shahriar, Qods, Iran, Qods, Malard, Golestan, Tehran, Golestan, Pakdasht, Qarchak, Nasimshahr, Parand, Pardis, Andisheh and Fardis. In the classical antiquity, part of the territory of present-day Tehran was occupied by Rhages (now Ray, Iran, Ray), a prominent Medes, Median city almost entirely des ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Civil Aviation Technology College
The Civil Aviation Technology College (CATC College)(Higher Education Center of Civil Aviation and Airports of the country) is the oldest training centre providing specialized manpower needed by Iran's civil aviation industry, It has been operating since 1938 (officially 1940) the order of Reza Shah Pahlavi. The College conducts its training programs in line with rules & regulations of Iranian Ministry of Higher Education. Also, this centre is a member of the Trainer Plus program of the International Civil Aviation Organization known as ICAO. Also, according to the growing needs of the aviation industry, short-term specialized and in-service courses approved by the Civil Aviation Organization, the International Civil Aviation Organization and the International Air Transport Association are offered in this centre. Civil Aviation Technology College is located on Meraj Street at the Mehrabad International Airport. History In general, before the official establishment, the facult ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
