An earlier study determined a mass of 0.93 solar masses for the white dwarf, while more recent studies found a mass of 0.57 solar masses with an effective temperature of 120,000 K and a luminosity 76 times that of the Sun. Henry found a mass 6.5 times that of the Sun for the progenitor star. About 80% of known white dwarfs have hydrogen-dominated atmospheres. The central star has the stellar classification DAO.5, indicating a hydrogen-rich white dwarf. This image was created from images through blue, green and red filters and the total exposure times were 12 minutes, 9 minutes and 7 minutes respectively. A careful look at the central part of this object reveals not only the knots, but also many remote galaxies seen right through the thinly spread glowing gas. Further out from the star and beyond the ring of knots, the red colour from hydrogen and nitrogen is more prominent. The blue-green glow in the centre of the Helix comes from oxygen atoms shining under effects of the intense ultraviolet radiation of the 120 000 degree Celsius central star and the hot gas. This colour-composite image of the Helix Nebula (NGC 7293) was created from images obtained using the the Wide Field Imager (WFI), an astronomical camera attached to the 2.2-metre Max-Planck Society/ESO telescope at the La Silla observatory in Chile. The nebula’s age is believed to be in the range between 9,400 and 12,900 years based on the measured expansion rate of 31 km/s −1. The Helix Nebula is believed to have formed about 10,600 years ago, when the central star, catalogued as GJ 9785, reached the end of its life cycle and shed its outer layers into space. The intense ultraviolet radiation from these stars causes the ejected layers of gas to glow. White dwarfs are very dense, typically packing a mass similar to that of the Sun into a volume comparable to that of the Earth. The stars become white dwarfs – hot remnant stellar cores – that energize the ejected material.
Planetary nebulae like the Helix are formed when stars that are not massive enough to go out as supernovae expel their outer envelopes at the end of their evolutionary cycles. Its striking appearance has earned it the nickname the Eye of God Nebula. With an apparent magnitude of 7.6 and an apparent size of 25 arcminutes, the nebula is visible in binoculars and easily observed in small telescopes in good conditions. It is one of the closest planetary nebulae to Earth, as well as one of the brightest. Featuring beautiful high resolution images, development sketches, design notes, developer insights, and behind-the-scenes commentary from the game’s creator.The Helix Nebula (NGC 7293) is a bright, large planetary nebula located 650 light years from Earth in the constellation Aquarius. Each map comes in both a full-colour poster version and a printable black & white version with ample space for taking notes!ĭiscover the hidden secrets behind the design and development of The Eyes of Ara in this detailed art book. Hunt down lost secrets and explore the castle like never before with these beautiful, hand-drawn maps.
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Provided in both high quality 320kbps MP3 format and uncompressed FLAC format. Solve elaborate puzzles, locate lost treasures, and unravel the mystery of The Eyes of Ara.Įxperience The Eyes of Ara’s beautiful, sweeping score with this Original Soundtrack by the game's composer, Matt Caradus. Explore a vast and ancient castle riddled with secret vaults and hidden rooms.
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