The seven planets of TRAPPIST-1 are all Earth-sized and terrestrial, according to research published in 2017 in the journal Nature. The system was named for the TRAPPIST telescope. The system has been revealed through observations from NASA's Spitzer Space Telescope and the ground-based TRAPPIST (TRAnsiting Planets and PlanetesImals Small Telescope) telescope, as well as other ground-based observatories. This artist's concept shows what the TRAPPIST-1 planetary system may look like, based on available data about the planets diameters, masses and distances from the host star. The National Radio Astronomy Observatory is a facility of the National Science Foundation, operated under cooperative agreement by Associated Universities, Inc. #Telescope glimpses population freefloating planets archiveData are archived at the Infrared Science Archive housed at the Infrared Processing and Analysis Center at Caltech. Spacecraft operations are based at Lockheed Martin Space Systems Company, Littleton, Colorado. Science operations are conducted at the Spitzer Science Center at Caltech in Pasadena, California. NASA's Jet Propulsion Laboratory, Pasadena, California, manages the Spitzer Space Telescope for NASA's Science Mission Directorate, Washington. The Smithsonian Astrophysical Observatory in Cambridge, Massachusetts, controls Chandra's science and flight operations. NASA's Marshall Space Flight Center in Huntsville, Alabama, manages the Chandra program for NASA's Science Mission Directorate in Washington, D.C. STScI is operated for NASA by the Association of Universities for Research in Astronomy, Inc., in Washington, D.C. The Space Telescope Science Institute (STScI) in Baltimore conducts Hubble science operations. NASA's Goddard Space Flight Center in Greenbelt, Maryland, manages the telescope. The Hubble Space Telescope is a project of international cooperation between NASA and ESA (European Space Agency). This image combines data from five different telescopes: the VLA (radio) in red Spitzer Space Telescope (infrared) in yellow Hubble Space Telescope (visible) in green XMM-Newton (ultraviolet) in blue and Chandra X-ray Observatory (X-ray) in purple. Astronomers therefore need to study the Crab Nebula across a broad range of electromagnetic radiation, from X-rays to radio waves. In the late 1960s astronomers discovered the crushed heart of the doomed star, an ultra-dense neutron star that is a dynamo of intense magnetic field and radiation energizing the nebula. If the blast had instead happened 50 light-years away it would have irradiated Earth, wiping out most life forms. The explosion took place 6,500 light-years away. Today we know it as the expanding gaseous remnant from a star that self-detonated as a supernova, briefly shining as brightly as 400 million suns. Astronomers saw a tentacle-like nebula in the place of the vanished star and called it the Crab Nebula. This "guest star" was forgotten about until 700 years later with the advent of telescopes. So bright in fact, it could be seen during the daytime for several months. In the summer of the year 1054 AD, Chinese astronomers saw a new "guest star," that appeared six times brighter than Venus.
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