... Credit: Juan Carlos Casado Explanation: Two unusually large sunspot groups are now crossing the face of the Sun . ... Sunspot group 10484 appears near the image center, while sunspot group 10486 is just coming over the left limb of the Sun. The active region associated with Sunspot 484 (the shorter nickname) has already jettisoned a large coronal mass ejection (CME) of particles out into the Solar System . ... NASA Official: Jay Norris. ... Publications with keywords: sunspot - active sun . ...

... 2004 July 26 . A Large Active Region Crosses the Sun . ... Explanation: An unexpectedly large sunspot region is now crossing the Sun. The active region is home to rivers of hot plasma , explosive flares , strong magnetic fields , a powerful Coronal Mass Ejection (CME), and a sunspot group so large it can be seen by the protected eye without magnification. In fact, this region appears larger than Venus did when it crossed the Sun last month. ... About APOD | ...

... Today this year's largest group of sunspots will cross the Sun's central meridian. ... The next day, the number of spots in the group reached five, and the day after, on June 2nd, it was possible to count thirteen sunspots on solar disk, which had been clear prior to this. ... This year's two most powerful active areas, which passed across the solar disk at the beginning of May, 2009, are set to appear in the Sun's eastern sector in two days, on June 6th. ...

Main Sections LabIR main page . Instrument page . Documentation . ... Special Sections Software Page . ... Tirgo Page . ... The activities of the group started at the end of 70's with the building of FIRT: the photometer of the National Infrared Telescope ( TIRGO ). ... FIRT: the photometer of the National Infrared Telescope ( TIRGO ). ... NICS , the NIR camera/spectrometer for the Telescopio Nazionale Galileo . ... Please select the LabIR Main Page or an item in the left menu. ...

... ESO is building what will be the World's largest optical telescope array, The Very Large Telescope (VLT). The VLT Project organisation is responsible for the design and construction of the Unit Telescopes, including enclosures, optics, adapter-rotators and coating unit. ... Unit Telescopes Overview - This page is outdated, an update is in process. ... Secondary mirror (M2 Unit) - This page is outdated, an update is in process. ... Coating Unit - This page is outdated, an update is in process. ...

... Astrophysics Group . Research . Optical Interferometry . ... COAST Interferometer . Magdalena Ridge Observatory Interferometer . ... Very Large Telescope Interferometer . ... These pages describe the research activities of the optical interferometry sub-group of the Cavendish Astrophysics Group . ... To this end, we are primarily involved in two optical interferometer projects, the Magdalena Ridge Observatory Interferometer (MROI), and the Very Large Telescope Interferometer (VLTI). ...

... RATAN-600 data for the BL Lacertae objects (multi-frequency catalogue, Version 1.0) . GPS radio sources . ... BL Lacertae objects . ... The difference between these objects is the peak frequency of the synchrotron component of their spectral energy distribution (HBLs: high-energy peak, LBLs: low-energy peak, IBLs: intermediate). ... The observations were carried out with the RATAN-600 radio telescope during 2006-2011 at six frequencies: 1.1, 2.3, 4.8, 7.7, 11.2 and 21.7 GHz. ...

Black holes . ... Black holes are objects for which the gravitational attraction is so strong that nothing, not even light, can escape from it. ... The material inside a black hole is concentrated into a singularity: a single point of infinitely high density where space and time are infinitely distorted. ... The existence of such black holes has been inferred in cases where the black hole pulls gas of a companion star that orbits around it. ... Gravity's Fatal Atraction: Black Holes in The Universe. ...

... An "active" member is a person who is, or has been, actively working on some aspect of E-ALFA within the last twelve months. ... If a consortium member/group wishes a member removed, that member/group sho