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      • Supermassive Black Holes: Enviroment and Evolution, 19-22 June, 2019, Corfu, Greece
      • First AHEAD gamma-ray workshop: Integral looks AHEAD to multi-messenger astrophysics, 11-15 February 2019, Geneva Switzerland
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      • The Hot and Energetic Universe
      • The Hot and Energetic Universe (full version, ~300MB)
      • Black Holes and Supernovae
      • Black Holes and Supernovae (full version, ~300MB)
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      • AGN (full version, ~2MB)
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    • The Hot and Energetic Universe: A planetarium movie
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      • INAF Press Release
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    • Scientists assemble to discuss the power of X-ray spectroscopy
    • Researchers’ Night 2017
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    • Press release for ATHENA
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    • Press release from the AHEAD Multi-messenger workshop in Alicante
  • Social media
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AHEAD

  • Home
  • About AHEAD2020
  • Open days
    • National Observatory of Athens (Penteli)
    • National Observatory of Athens (Thissio)
  • Events
    • Conferences
      • Supermassive Black Holes: Enviroment and Evolution, 19-22 June, 2019, Corfu, Greece
      • First AHEAD gamma-ray workshop: Integral looks AHEAD to multi-messenger astrophysics, 11-15 February 2019, Geneva Switzerland
  • Videos
    • AHEAD
      • Virtual Reality videos
        • The Hot and Energetic Universe – Virtual Reality (VR) edition
        • The X ray Universe – Virtual Reality (VR) edition
      • Hot and Energetic Universe – El Universo caliente y energĂ©tico (Spanish Narration)
      • The Hot and Energetic Universe (flat version, HDTV)
      • The Hot and Energetic Universe (short version)
      • Short version of “The Hot and Energetic Universe” (Greek narration and subs)
      • The Hot and Energetic Universe (version for DOME theatres)
      • Black Holes
      • Gamma Ray Bursts
      • Gamma ray astronomy
      • Why Observe from Space
      • AHEAD advertising video
      • AHEAD video for National Observatory of Athens
    • NOA
      • NOA
    • Documentaries
    • Public Lectures
    • HEASARC
      • ESO
    • ESA
  • Images
    • HEASARC
    • ESO
    • APOD
    • HEAPOW
  • Educational
    • Booklet for Dome Video (ESO website)
    • Booklet for Dome Video
    • Guide for visitors (Dome Video)
    • Posters
      • About AHEAD
      • The Hot and Energetic Universe
      • The Hot and Energetic Universe (full version, ~300MB)
      • Black Holes and Supernovae
      • Black Holes and Supernovae (full version, ~300MB)
      • AGN
      • AGN (full version, ~2MB)
      • Gravity
      • Gravity (full version, ~2MB)
      • X-ray Observations/Surveys
      • X-ray Observations/Surveys (full version, 2MB)
    • Below age of 14
      • Star child (NASA)
      • ESA kids (ESA)
      • Presentations
    • Above age of 14
      • Imagine
      • XMM learning centre
      • SWIFT learning centre
      • RXTE learning centre
      • Fermi education centre
      • A brief History of High Energy Astronomy (NASA)
      • ESA education (ESA)
    • Advanced
      • Astronomy exercises (ESA/ESO)
      • Hubble Public Lectures (NASA)
  • Links
    • AHEAD main site (INAF)
    • Public Outreach
      • The Athena X-ray Observatory
      • European Gravitational Observatory (EGO)
      • 3XMM
      • ESA
      • ESO/ePOD
      • ESO-Press Release
      • HEASARC
      • WebStars
      • Ask an astrophycist
      • Cosmic Distances
      • AstronomyNow
    • Missions
      • INTEGRAL
      • XMM-NEWTON
      • AstroSat
      • Swift
      • Chandra
      • AGILE
      • ATHENA
  • Press
    • The Hot and Energetic Universe: A planetarium movie
    • Scientists invited to take advantage of leading high energy research centres
    • INAF Press Release: X-ray bombardment
    • AHEAD’s planetarium movie wins the international fulldome film competition
      • INAF Press Release
      • NOA Press Release
      • LU Press Release
    • Scientists assemble to discuss the power of X-ray spectroscopy
    • Researchers’ Night 2017
      • INAF Rome Press Release
      • NOA Press Release
    • Press release for ATHENA
      • NOA press release
      • INAF Rome press release
    • Press release from the AHEAD Multi-messenger workshop in Alicante
  • Social media

Month: April 2020

Tycho’s Supernova Remnant Animations

April 28, 2020April 28, 2020 Ektoras PouliasisVideo

In 1572, Danish astronomer Tycho Brahe was among those who noticed a new bright object in the constellation Cassiopeia. Adding fuel to the intellectual fire that Copernicus started, Tycho showed this “new star” was far beyond the Moon, and that Read More …

Star somehow survives close encounter with black hole!

April 26, 2020 Ektoras PouliasisArticle

Astronomers may have discovered a new kind of survival story: a star that had a close interaction with a giant black hole and managed to survive and tell its story through exclamations of X-rays. Scientists recorded the event with the Read More …

The Power of Shock Waves in a Nova Explosion!

April 18, 2020 Ektoras PouliasisArticle
Novae originate in binary systems where a white dwarf picks-up gas from a sun-like companion. NASA's Goddard Space Flight Center/S. Wiessinger

In 2018, astronomers observed in high resolution a nova explosion with three different space telescopes: NASA’s Fermi and NuSTAR space telescopes, as well as the Canadian BRITE-Toronto nano-satellite, and they have captured the first direct evidence that most of the Read More …

Surprise! Universe expansion may not be uniform!

April 11, 2020April 11, 2020 Ektoras PouliasisArticle
Cosmic expansion measured across the sky. Credit: K. Migkas et al. 2020 – CC BY-SA 3.0 IGO

The last decades, astronomers have assumed that the Universe is expanding at the same rate in all directions. However, a new research, based on data from three X-ray space observatories, indicates that this fundamental assumption might be incorrect. The idea Read More …

First-ever image of powerful jets procuded by a Super-massive Black Hole!

April 8, 2020April 8, 2020 Ektoras PouliasisArticle, Uncategorized

A year ago, the Event Horizon Telescope (EHT) Collaboration observed for the first time the supermassive black hole at the center of the nearby radio galaxy M87, finding the dark central shadow that was in agreement with General Relativity, further Read More …

Our own beautiful Milky Way!

April 7, 2020April 7, 2020 Ektoras PouliasisImage

The central region of our galaxy, the Milky Way, contains an exotic collection of objects, including a supermassive black hole weighing about 4 million times the mass of the Sun (called Sagittarius A*), clouds of gas at temperatures of millions Read More …

A cosmic story of Dr. Jekyll and Mr. Hyde: A double star system appears to change its behavior rapidly and unpredictably!

April 5, 2020April 5, 2020 Ektoras PouliasisArticle

Astronomers have detected a double (or a binary as it is called) star system that it is flip-flopping between two alter egos using NASA’s Chandra X-ray Observatory and the National Science Foundation’s Karl F. Jansky Very Large Array (VLA). This Read More …

Case: A cosmic homicide!

April 2, 2020April 2, 2020 Ektoras PouliasisArticle

An artistic view of a star tearing apart by a black hole. Image credit: NASA. Astronomers solved the mystery and found the perpetrator, an intermediate-mass black hole that was caught in action tearing apart a star that just happened to Read More …

Are you ready to explore the X-ray Universe?

Welcome to CLAXSON!

(Classification of X-ray Sources for Novices)

CLAXSON is a platform that trains you to identify new objects observed in the X-ray sky with the European Space Agency X-ray telescope XMM-Newton. Be the first to find new supermassive black holes, stars, galaxies and other exotic objects in observations taken over the last 20 years, and help astronomers unravel the mysteries of the X-ray sky.

Recent Posts

  • #AthenaNuggets: Squeezing of Pulsar Wind Nebulae, by Diego F. Torres
  • A fast and young magnetar found not that far from the Milky Way!
  • eROSITA discovers a new Supercluster of galaxies!
  • China launches gamma ray–hunting satellites to trace sources of gravitational waves!
  • Black Hole’s Dust Ring May Be Casting Shadows From Heart of a Galaxy!

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Latest Events

  • National Observatory of Athens hosted a pre-event to Researchers’ Night 2017
    September 25, 2017
  • Researchers’ Night 2017: Friday 29 September
    September 25, 2017

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Invitation to submit news

Astronomers are invited to advertise their work and/or recent results in our website. Publications/news related to High Energy Astrophysics are of particular interest.

A brief text along with a related image should be sent to the following email addresses:
gmountrichas@gmail.com
igeorgantopoulos@gmail.com

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