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    35 m-diameter dish of ESA’s deep-space tracking station at New Norcia, Australia, lit by ground lights against the night sky on 2015.08.03. (Credit: D. O’Donnell/ESA - CC BY-SA 3.0) Part of Estrack global system of ground stations linking satellites & the European Space Operations Centre in Germany. ESA tracking stations communicate with spacecraft to transmit commands & receive data & spacecraft status info. ESA shares Estrack capacity with other space agencies, who then support ESA missions.

    Schematic showing periodic shifting of spectral lines in a spectrosciopic binary system.

    With parallax technique, astronomers observe object at opposite ends of Earth’s orbit around the Sun to precisely measure its distance. CREDIT: Alexandra Angelich, NRAO/AUI/NSF. home page. Version as of 08:00, 26 October 2013. Useful information for satellite-watchers and amateur astronomers. (Source: Chris Peat)

    ▶ Ode To Hubble - Hubble's Universe. Winning video in the under-25 category of the 25th anniversary competition #Ode to Hubble. (Credit: Halley Davies and Martin Hellmich, Canada)

    Pierre Auger Cosmic Ray Observatory. Pampa Amarilla in western Argentina. This picture shows one of the detectors. A high energy cosmic ray hitting the atmosphere produces an air shower. The observatory is designed to detect and measure these air showers. Mona Evans, “ABC of Astronomy – C is for Cosmic Rays” www.bellaonline.c...

    ASTRON is the Netherlands Institute for Radio Astronomy. This work by artist Danielle Futselaar shows radio telescopes and some of the deep sky objects they study.

    Engineers practice "snow cleaning'" on a test telescope mirror for the James Webb Space Telescope. By shooting carbon dioxide snow at the surface, large telescope mirrors can be cleaned without getting scratched. The Webb telescope is the scientific successor to the Hubble Space Telescope. It will be the most powerful space telescope ever built. Webb is an international project led by NASA and its partners, the European Space Agency & the Canadian Space Agency. (Image credit: NASA/Chris Gunn)

    Light is energy that can take on many forms. Radio waves, microwaves, infrared, visible, ultraviolet, X-ray and gamma radiation are all different forms of light. (Illustration: NASA/CXC/M.Weiss)

    Space in Images - 2015 - 04 - Hubble 25 (without title) From planets to planetary nebula, and from star formation to supernova explosions, the NASA/ESA Hubble Space Telescope has captured a wealth of astronomical objects in its 25-year career. This montage presents 25 images that sample the space telescope’s rich contribution to our understanding of the Universe around us.

    Orion Nebula. Favorite Hubble image of Tanya Hill, Senior Curator (Astronomy) at Museum Victoria. “I was a high school student when I first saw the nebula through a small telescope. What I saw on that long ago night was an amazingly delicate and wispy cloud of gas in black and white. One of the wonderful things that Hubble does is to reveal the colours of the universe.” (Credit: NASA,ESA, M. Robberto (STSI/ESA) & the HST Orion Treasury Project Team)

    Eratosthenes and the Circumference of the Earth. (Credit: Rogue Robot PRO) This short film tells how, 2500 years ago, mathematician & geographer, Eratosthenes, worked out with great accuracy, the circumference of the Earth. The film was shortlisted for the 2014 Guardian Witness Science Film Award & came second place in the Scan Velocity 2014 film competition. Mona Evans, "Columbus and the Flat Earth Myth" www.bellaonline.c...

    ▶ The Hubble Space Telescope: The Most Important Instrument Ever Built. Narrated by Tony Darnell. Happy 25th birthday, Hubble!

    Kepler's K2 mission, Campaign 4. From February to April 2015 K2 will be observing almost 16,000 target stars. This includes the two best known open star clusters, the Pleiades and the Hyades in Taurus.

    25 Years of Deep-Space Astronomy: How the Hubble Space Telescope Works

    Semi-finals of the 25th anniversary favorite Hubble Space Telescope images. Voting for the final image starts on April 1. Go here if you want to vote:

    German stamp commemorating the 200th anniversary of the birth of Fraunhofer (Germany, 1987). Fraunhofer Lines are the dark lines in the absorption spectrum of the sun, described in detail by Joseph von Fraunhofer. Of the 25,000 lines in the solar spectrum, von Fraunhofer mapped 576, assigning letters to identify the most prominent ones.

    Comet 2014 Q2 (Lovejoy), on December 27, 2014, as seen by the Dark Energy Survey. (Credit: Fermilab’s Marty Murphy, Nikolay Kuropatkin, Huan Lin and Brian Yanny.) The comet just happened to come into the field of view of the 570-megapixel Dark Energy Camera, the world’s most powerful digital camera.

    Trail of Stars | Tariq Shaar, made this digital painting inspired by Hubble's discoveries in space! All part of the 25th anniversary celebration.

    18th Century Persian astrolabe – maker unknown. The points of the curved spikes on the front rete plate mark the positions of the brightest stars. The name of each star being labeled at the base of each spike. The back plate, or mater, is engraved with projected coordinate lines. (Image credit: Andrew Dunn, From the Whipple Museum of the History of Science in Cambridge)

    Close-up of part of the rings of the planet Saturn. (Credit: Cassini/University of Colorado). By using ultraviolet light reflected by the rings, scientists can see what kinds of materials are present. Here turquoise colours represent water ice while red indicates dust. The rings are easily visible in a small telescope despite being between only 10 metres and 1 kilometre thick. This image spans about 35,000 kilometres.

    April 24, 2015 marks the historic launch of the Hubble Space Telescope aboard the space shuttle Discovery. Join in the celebration and stay in the loop with #Hubble25.

    The sky in gamma ray light. The bright central band is the central plane of our Galaxy. Here gamma rays are produced by collisions between particles accelerated in the shock waves of exploding stars & the gas in the space between the stars. Beyond the Galaxy, most of the bright spots are from galaxies with supermassive black holes. Material falling into them glows in gamma ray light because it's so hot. (Image ©NASA/DOE/Fermi LAT Collaboration /5-yr data summary from Fermi Gamma Ray Telescope)

    January 2015. NASA's Kepler Space Telescope has, to date, offered scientists more than 4,000 candidate planets -- the 1,000th of which was recently verified. Eight are less than twice Earth-size and in their stars' habitable zone. All eight orbit stars cooler and smaller than our sun. The search continues for Earth-size habitable zone worlds around sun-like stars. (Credit: NASA Ames/W Stenzel)

    The electromagnetic spectrum. The light that we can see is just one kind of electromagnetic radiation. It comprises the narrow range of wavelengths to which our eyes have evolved to respond. These wavelengths and the rest of the spectrum make it possible for us to explore the Universe.