Archive:Science World at TELUS World of Science

2007-03-01T16:03:46Z

85.0.104.137:

[[Image:041002223500 the bulb of science world at night.jpg|thumb|right|250px|'Science World At Night' by Ivan Lam ]]'''TELUS World of Science, Vancouver''' is a [[Science museum|science centre]] run by a non-profit organization in [[Vancouver]], [[British Columbia]], [[Canada]]. It is located at the end of [[False Creek]], and features many permanent interactive exhibits and displays, as well as areas with varying topics throughout the years.

The building's former name was '''Science World''', still the name of the organization. The building's name change to the '''[[TELUS World of Science]]''' became official on July 20, 2005 following a $9-million donation to the museum from [[TELUS]].<ref>http://www.scienceworld.ca/pdf/pressrelease/TELUS%20World%20of%20Science%20Name%20Change.pdf</ref> The official name of the science centre was subsequently changed to "TELUS World of Science", although it is still routinely referred to as "Science World" by the public.

==History==

In [[1977]], Barbara Brink ran mobile hands-on exhibits known as the ''Extended I'' around the Lower Mainland. Later, the temporary ''Arts, Sciences & Technology Centre'' opened on January 15, [[1982]] attracting over 600,000 visitors. Another 400,000 benefited from the centre’s outreach programs, which were delivered around the province.
[[Image:ScienceWorldVancouverBC.jpg|thumb|left|300px|Science World, Vancouver, B.C.]]
Following the [[Expo 86]] World’s Fair, an intensive lobbying campaign was launched to secure the landmark Expo Centre building for Science World. With much government backing, the [[geodesic dome]], designed by [[Buckminster Fuller]], was obtained from the province and a massive fund-raising campaign ensued. Donations from the federal, provincial and municipal governments, the GVRD, the private sector, foundations, and individuals contributed $19.1 million to build an addition to the Expo Centre, redesign the interior and fabricate exhibits. In [[1988]], in a four month preview, over 310,000 visitors came to see the new building. A year later, a 400 seat [[OMNIMAX]] theatre in the upper section of the dome was opened. <ref>http://www.scienceworld.ca/whats_on/omnimax_theatre/omnifacts.htm</ref>

The centre entered its first title sponsorship agreement with [[Alcan|Alcan Inc.]] in 1996, renaming its OMNIMAX Theatre the ''Alcan OMNIMAX'' Theatre. Alcan has since decided to sponsor the organization in different ways and the theatre has returned to its original name, the OMNIMAX Theatre. In January of 2005, the building was officially renamed "TELUSphere" as part of an agreement where TELUS gave a $9-million donation in return for the "naming rights" of the building. This new name proved universally unpopular. In the summer of 2005, TELUS and Science World officially changed the name of the building to the ''TELUS World of Science''. This maintained consistency with other "TELUS World of Science" centres in Calgary and Edmonton that were named in the meantime. This name change has not affected the nearby [[Main Street-Science World Station|Skytrain station]] and the general public still refers to it as Science World.

==Related links==

* [[TELUS World of Science]]
* [[TELUS World of Science, Calgary]]
* [[TELUS World of Science, Edmonton]]

==Notes==
<div class="references-small">
<references/>
</div>

==External links==
* [http://www.telusworldofscience.com/vancouver/ Official Website]
* [http://www.telusworldofscience.com/ Homepage for all TELUS Worlds of Science]
* [http://www.petitiononline.com/telus04/petition.html Online petition] requesting that "Science World" remain free of corporate branding.
{{coor title d|49.273251|N|123.103767|W}}

{{Vancouver landmarks}}

[[Category:Museums in Vancouver]]
[[Category:Science museums]]
[[Category:Tourism in Vancouver]]

[[de:Science World]]

Archive:Hoag's Object

2006-07-10T22:45:50Z

85.0.161.86:

{{ Galaxy
| name = Hoag's Object
| image = [[Image:Hoag'sobject.jpg|300px]]
<small>Hoag's Object taken by the [[Hubble Space Telescope]]</small>
| epoch = [[J2000.0]]
| type = SA0(r)
| ra = 15<sup>h</sup> 17<sup>m</sup>
| dec = +21° 35′
| dist_ly = [[1 E24 m|600 million]] [[light year|ly]]
| appmag_v = +15.5
| size_v = 54"
| constellation name = [[Serpens Caput]]
| radius_ly = 120,000 ly
| absmag_v = ?
| notes = Ring galaxy
| names = PGC 54559
}}

'''Hoag's Object''' is a non-typical [[galaxy]] of the type known as a [[ring galaxy]]. The sheer beauty of this object has riveted amateur astronomers as much as its uncommon structure has fascinated professionals. The galaxy was discovered in [[1950]] by astronomer [[Art Hoag]].

<br>

==Characteristics==
A nearly perfect ring of young hot blue [[star]]s circle the older yellow nucleus of this ring galaxy 600 million [[light-year]]s away in the constellation [[Serpens]]. The galaxy is about 120,000 light-years wide, which is slightly larger than the [[Milky Way Galaxy]]. The gap separating the two stellar populations may contain some [[star cluster]]s that are almost too faint to see. As rare as this type of galaxy is, oddly another ring galaxy can be seen, between the nucleus and the outer ring at the 1:00 position.

==History and formation==
In the initial announcement of his discovery, Art Hoag proposed the hypothesis that the visible ring was a product of [[gravitational lensing]]. This idea was later discarded due to the fact that the nucleus and the ring have the same [[redshift]], and because more advanced telescopes revealed the knotty structure of the ring, something that would not be visible if the ring were the product of gravitational lensing.

Many of the details of the galaxy remain a mystery, foremost of which is how it formed. So-called "classic" ring galaxies are generally formed by the collision of a small galaxy with a larger disk-shaped galaxy. This collision produces a density wave in the disk which leads to a characteristic ring-like appearance. However, there is no sign of any second galaxy that would have acted as the "bullet", and the core of Hoag's Object has a very low velocity relative to the ring, making the typical formation hypothesis quite unlikely.

It has been suggested that Hoag's Object might be a product of an extreme "bar instability" which occurred a few billion years ago in a [[barred spiral galaxy]]. Schweizer, et. al. (1987) claim that this is an unlikely hypothesis due to the fact that the nucleus of the object is spheroidal, whereas the nucleus of a barred spiral galaxy is disc-shaped, among other reasons. However, they admit evidence is somewhat thin for this particular dispute to be settled satisfactorily. Interestingly, a few galaxies share the primary characteristics of Hoag's Object, including a bright detached ring of stars, but their centers are elongated or barred, and they may exhibit some spiral structure. While none match Hoag's Object in symmetry, this handful of galaxies are known to some as Hoag-type galaxies.

While there is much still to be explained about the formation of Hoag's Object, it is suggested that a major "accretion event", in other words a collision or a capturing of one galaxy by another, caused the formation of the galaxy we see today. The event likely took place at least 2-3 billion years in the past, and may have resembled the processes that form [[polar-ring galaxy|polar-ring galaxies]].

Astronomical position (J2000): RA 15h17m17s DEC +21°34'45", in Serpens.

==References==
* Hoag, A. A. (1950), ''AJ'', '''55''', 170
* Schweizer, Francois; Ford, W. Kent Jr.; Jedrzejewski, Robert; and Giovanelli, Riccardo (1987). [http://oposite.stsci.edu/pubinfo/PR/2002/21/rel/ApJ320-454-1987.pdf The structure and evolution of Hoag's Object]. ''The Astrophysical Journal'' '''320''', 454-463.

==External links==
*[http://heritage.stsci.edu/2002/21/big.html Hubble Space Telescope image of Hoag's Object.]
* http://nedwww.ipac.caltech.edu/level5/Rings/Rings17_2.html
* http://oposite.stsci.edu/pubinfo/PR/2002/21/index.html
* [http://nedwww.ipac.caltech.edu/cgi-bin/nph-objsearch?objname=hoag%27s+object&extend=yes&out_csys=Equatorial&out_equinox=J2000.0&obj_sort=RA+or+Longitude&of=pre_text&zv_breaker=30000.0&list_limit=5&img_stamp=YES NASA/IPAC Extragalactic Database data for Hoag's object]

[[Category:Ring galaxies]]
[[Category:Serpens constellation]]

[[sk:Hoagov objekt]]

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Archive:Science World at TELUS World of Science

Archive:Hoag's Object