... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... Risks Comparable to NEOs . ... The Increasing Rate of Discovery of Asteroids . ... Comet and Asteroid Collision Probabilities . ... Extreme albedo comets and the impact hazard (PDF Format) . ... Asteroid Impact Animations . ... Workshop on Scientific Requirements for Mitigation of Hazardous Comets and Asteroids - 2002 . ... The Spaceguard Survey Report, 1992 (PDF) . Tsunami from Asteroid/Comet Impacts . ...

... To Fly Free in Space . ... STS-41B , NASA Explanation: At about 100 meters from the cargo bay of the space shuttle Challenger, Bruce McCandless II was farther out than anyone had ever been before. Guided by a Manned Maneuvering Unit (MMU), astronaut McCandless, pictured above , was floating free in space. McCandless and fellow NASA astronaut Robert Stewart were the first to experience such an "un tether ed space walk " during Space Shuttle mission 41-B in 1984 . ... January . ...

... 2001 October 2 . A Flying Astronaut Over Earth . Credit: Shuttle Crew STS-64 , NASA . Explanation: What would it be like to fly free over the seas and clouds of Earth? In 1994 astronaut Mark Lee found out when he tested the Simplified Aid for EVA Rescue (SAFER) system for NASA . ... Pictured , Lee jets about the bay of Space Shuttle Discovery , over 200 kilometers above Earth in the first un tethered space walk in ten years. ... About APOD | ... NASA Technical Rep.: ...

National Aeronautics and Space Administration . ... Robert L. Curbeam, Jr., ... Curbeam served as a spacecraft communicator (CAPCOM) responsible for relaying all voice communication between Mission Control and crews aboard the Space Shuttle and International Space Station, CAPCOM Branch Chief, and Payloads Group Lead, responsible for representing the crew office in the design, training and operation of on orbit experiments, and Safety Branch Chief for the astronaut office. ... DECEMBER 2007 ...

Star formation is often best manifested by bright H II regions.These are regions of hydrogen which have been ionized by ultraviolet photons which are emitted from massive stars (typically stars more than 20 times the mass of the Sun). ... A narrowband filter image centered on this wavelength will then readily reveal these H II regions and hence the current sites of star formation in a galaxy, The luminous blobs that can be seen here are all H II regions . ... NGC 3558 Visual . NGC 3558 Infrared . ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Member States . ... United Kingdom . Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... ESO Science Newsletter . ... VLT Unit Telescopes Names . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... ESO Science Outreach Network . ... This is the shadow of the Earth Credit: . ...

. XMM-Newton Science Analysis System . ssclib (ssclib-3.33.4) [xmmsas_20080701_1801-8.0.0] . Meta Index / Home Page / Miscellaneous utilities . Author: Clive Page (University of Leicester, cgp@star.le.ac.uk) . This subroutine returns a number of a free I/O unit, i.e. one that is not currently allocated to and file. The calling sequence is: . SUBROUTINE getFreeIoUnit(nunit) INTEGER, INTENT(out) :: nunit ! unit number free for use . XMM-Newton SOC/SSC -- 2008-07-01

... HST . ... Data . ... HST Overview . Overview . ... Retrieving HST Data . ... This FORM is a quick tool for flux conversion between diverse unit systems. ... INPUT FLUX or MAGNITUDE UNITS CLEAR Jy W/m2/Hz W/m2/um W/cm2/um erg/cm2/s/Hz erg/cm2/s/A photons/m2/w/um photons/cm2/s/A AB magnitude magnitude V magnitude U magnitude B magnitude R magnitude I magnitude J magnitude H magnitude K magnitude L magnitude L1 magnitude M magnitude N magnitude Q . ... Enter the Input Flux or Magnitude Value : . ...

... Tonight's Sky . ... Observing . ... Sky this Month . ... Gravitational wave search provides insights into galaxy evolution and mergers . ... The double star 54 Leonis, spiral galaxy NGC 3198, and emission nebula NGC 3199 . ... Open cluster NGC 2818, spiral galaxy NGC 2964, and spiral galaxy NGC 2976 . ... Astronomy for Kids . ... Observing Basics . ... University of Southampton, United Kingdom . ... Receive news, sky-event information, observing tips, and more from Astronomy's weekly email...

... J5: Radio and Radar Studies of the Solar System. ... Analogously, the key idea of the USSR (United Solar System Radar) concept would be the thousandfold increase in sensitivity over existing radar astronomy facilities, and besides, only the tenfold increase in transmitting power and collecting areas of transmitting and receiving antennas is necessary for this purpose. ... So, let us try to imagine the scientific impact, which would provide this United Solar System Radar. ... 3)  Asteroid's moons; . ...

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