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Extrasolar planet

Extrasolar planet
2 January 2013: Astronomers state that the Milky Way may contain as many as 400 billion exoplanets, with almost every star hosting at least one planet.[1][2][3] An exoplanet or extrasolar planet is a planet outside the Solar System. Around 1800 such planets have been discovered[5][6][7] (1783 planets in 1105 planetary systems including 460 multiple planetary systems as of 18 April 2014).[8] The nearest known exoplanet, if confirmed, would be Alpha Centauri Bb, but there is some doubt about its existence. Almost all of the planets detected so far are within the Milky Way; however, there have been a small number of possible detections of extragalactic planets. As of March 2014[update], the least massive planet known is PSR B1257+12 A, which is about twice the mass of the Moon. History of detection[edit] Early speculations[edit] In the eighteenth century the same possibility was mentioned by Isaac Newton in the "General Scholium" that concludes his Principia. Discredited claims[edit]

Related:  Exo-planets

Rich exoplanet system discovered 24 August 2010Last updated at 14:03 By Victoria Gill Science reporter, BBC News The researchers say the finding marks a new phase in the hunt for exoplanets Astronomers have discovered a planetary system containing at least five planets that orbit a star called HD 10180, which is much like our own Sun. The star is 127 light years away, in the southern constellation of Hydrus.

Interstellar medium In astronomy, the interstellar medium (or ISM) is the matter that exists in the space between the star systems in a galaxy. This matter includes gas in ionic, atomic, and molecular form, dust, and cosmic rays. It fills interstellar space and blends smoothly into the surrounding intergalactic space. The energy that occupies the same volume, in the form of electromagnetic radiation, is the interstellar radiation field.

GJ 422 b GJ 422 b is an extrasolar planet orbiting Innes' star. It was discovered in 2014. It has mass about 10 Earth masses, thus it may be a super-Earth or a sub-Neptune. It is probably located within the circumstellar habitable zone (HZ) of the Innes' star: its HZ extends from 0.11 to 0.21 a. u., and the planet's semi-major axis is 0.119+0.014 −0.011 a. u. Astronomers may have just discovered the first known free-floating planet There isn't any reason this object wouldn't or couldn't have satellites of its own; and probably does. Earth has 1-6 moons at any given time, but we don't really notice them because they're small and interloping. Here, experiment: Sadly there is no way to intelligently answer those questions at this time beyond "Well, we do not know of any reason either of those things should be impossible, but we do not know anything about what would make that possible either." We simply have no empirical evidence to work with here except for what we can observe in our own solar system, and we have absolutely no way to know whether what we observe here could be considered "typical" or whether our system represents some extreme abberration... or even whether the interactions which govern stellar/planetary formation allow for the word "typical" to have any meaning whatsoever.

Astronomical object Above the round domes of La Silla Observatory, three astronomical objects in the Solar System — Jupiter (top), Venus (lower left), and Mercury (lower right).[1] Types of Solar System bodies. Astronomical objects or celestial objects are naturally occurring physical entities, associations or structures that current science has demonstrated to exist in the observable universe.[2] The term astronomical object is sometimes used interchangeably with astronomical body. Typically, an astronomical (celestial) body refers to a single, cohesive structure that is bound together by gravity (and sometimes by electromagnetism). Examples include the asteroids, moons, planets and the stars. Astronomical objects are gravitationally bound structures that are associated with a position in space, but may consist of multiple independent astronomical bodies or objects.

HAT-P-9b References[edit] External links[edit] Media related to HAT-P-9b at Wikimedia Commons Coordinates: Unprecedented: Amateur astronomers discover a planet with four suns False. At least in understanding, suns can be anywhere, Sol is the name of the star we orbit. Take your innacurate indignation elsewhere I thought we were in the Sol system? From what I've observed, a 'sun' is a title we give a star in relation to objects in its system, such as how we call large satellites 'moons'. It used to bother me that we'd call them suns, but the more I think about it, the more it makes sense to me that we can use it as a relative term such as 'ground' and 'sky'.

Physics Various examples of physical phenomena Physics is one of the oldest academic disciplines, perhaps the oldest through its inclusion of astronomy.[8] Over the last two millennia, physics was a part of natural philosophy along with chemistry, certain branches of mathematics, and biology, but during the Scientific Revolution in the 17th century, the natural sciences emerged as unique research programs in their own right.[b] Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics are not rigidly defined. New ideas in physics often explain the fundamental mechanisms of other sciences[6] while opening new avenues of research in areas such as mathematics and philosophy.