Following the discovery of the planet Neptune in 1846, there was considerable speculation that another planet might exist beyond its orbit. The search began in the mid-19th century and culminated at the start of the 20th with Percival Lowell's quest for PlanetX. Lowell proposed the PlanetX hypothesis to explain apparent discrepancies in the orbits of the giant planets, particularly Uranus and Neptune, speculating that the gravity of a large unseen ninth planet could have perturbed Uranus enough to account for the irregularities.
Clyde Tombaugh's discovery of Pluto in 1930 appeared to validate Lowell's hypothesis, and Pluto was officially named the ninth planet. In 1978, Pluto was conclusively determined to be too small for its gravity to affect the giant planets, resulting in a brief search for a tenth planet. The search was largely abandoned in the early 1990s, when a study of measurements made by the Voyager 2 spacecraft found that the irregularities observed in Uranus's orbit were due to a slight overestimation of Neptune's mass. After 1992, the discovery of numerous small icy objects with similar or even wider orbits than Pluto led to a debate over whether Pluto should remain a planet, or whether it and its neighbours should, like the asteroids, be given their own separate classification. Although a number of the larger members of this group were initially described as planets, in 2006 the International Astronomical Union reclassified Pluto and its largest neighbours as dwarf planets, leaving Neptune the farthest known planet in the Solar System.
On Planet 51, green humanoids with snail-like feelers and pointed ears live peacefully in a society reminiscent of 1950s United States, but with alien technology and with 1950s-themed alien homes. In the town of Glipforg, Lem is a teenage boy with a new part-time job at the local planetarium and he has a long-time crush on his neighbor, Neera. His best friend is Skiff, a big fan of the Humaniacs films. At a barbecue Neera's family is having, Lem tries to ask her on a date, but her hippie friend, Glar, keeps interrupting with his protest songs.
Rare is the eighth studio album by Britishrock band Asia, released in 2000. It is completely instrumental, and the only performers on this CD are John Payne and Geoff Downes. Tracks 1–16 were created for David Attenborough's nature film, "Salmon: Against the Tides", and 17–22 for an unreleased CD Rom video game.Rare is Asia's first studio album not titled with a word beginning and ending with the letter 'a'.
Rare is an international conservation organization whose stated mission is to help communities adopt sustainable behaviors toward their natural environment and resources. The organization uses social marketing and technical interventions to address threats like overfishing, deforestation and unsustainable agricultural practices. Rare’s work is founded on the belief that most of the threats faced by the environment are the result of human behavior, and that changing human behavior requires appealing to people using both rational and emotional arguments and removing any barriers that might prevent change.
Rare was founded on January 1, 1973 by David Hill. The organization was originally headquartered at the offices of the National Audubon Society in New York before joining the World Wildlife Fund in the 1980s. In 1987, Rare returned to being an independent entity.
Currently headquartered in Arlington, Virginia, in the United States, Rare also has offices in the Philippines, Indonesia, China, Brazil, Mozambique, Mexico and Micronesia. Rare has worked with communities and local partners in 56 countries to design and deliver its signature "Pride campaigns", which aim to change behaviors and promote scalable resource use solutions.
Studies of the rocket-ramjet and solid-fueled ramjet concepts began at the U.S. Navy's Naval Air Missile Test Center– later the Naval Missile Center– at Point Mugu, California in 1956, with the intent of increasing the range of small air-to-air missiles through using the combined ramjet and rocket propulsion system with solid fuels only. Following extensive ground testing, the concept was considered promising enough for a flight-test vehicle to be constructed to fully evaluate the new engine.
The first flight test vehicle, known as Ram Air Rocket Engine or RARE, was developed by the Naval Ordnance Test Station at China Lake, California. RARE was constructed using a conventional five-inch (127mm) rocket tube, 10 feet (3.0m) in length and weighing 153 pounds (69kg). Rocket-sled tests conducted during 1956 indicated that the rocket-ramjet configuration would be stable; three flight tests were conducted between 1959 and 1960, with the RARE rocket reaching speeds of Mach 2.3.
Mining is the extraction of valuable minerals or other geological materials from the earth from an orebody, lode, vein, seam, reef or placer deposits which forms the mineralized package of economic interest to the miner.
Mining of stones and metal has been a human activity since pre-historic times. Modern mining processes involve prospecting for ore bodies, analysis of the profit potential of a proposed mine, extraction of the desired materials, and final reclamation of the land after the mine is closed.
Mining operations usually create a negative environmental impact, both during the mining activity and after the mine has closed. Hence, most of the world's nations have passed regulations to decrease the impact. Worker safety has long been a concern as well, and modern practices have significantly improved safety in mines.