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    (3+d)-Dimensional Superspace Groups

    Wave-like modulations with non-lattice periodicities accompany a variety of important physical phenomena (e.g. magnetism and superconductivity). Though such a material is not properly crystalline in three dimensions, it does have a regular crystal lattice in a higher dimensional superspace. The superspace symmetry groups in (3+1), (3+2) and (3+3) dimensions have now been exhaustively tabulated, which will make it easier to solve modulated structure and understand their properties.

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    West Mountain, Moon, Venus, and Stars

    This image was secured just after the end of evening twilight on a clear April night from the West Mountain Observatory. The view is looking west past the domes housing the two smaller research telescopes at the observatory. The thin crescent Moon is also illuminated by reflected light from the Earth that is known as earthshine. Higher in the sky, the bright 'star' is actually the planet Venus. In between the two, the 'V' shaped group of stars in the constellation of Taurus is in reality the nearby open cluster known as the Hyades. Photo credit: Dr. Michael D. Joner

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    Transit of Mercury

    If you missed your chance to see the transit of Mercury on May 9, 2016, you only need to wait a few years to get another chance. While Venus transits are rare and occur about twice in a century, Mercury will transit the Sun 14 times in this century. The next such event will occur on November 11, 2019. Mercury is the tiny black dot seen just below the center of the picture. The larger sunspot group seen just above the center of the picture was designated AR 2542. This picture was taken in Provo by Professor Michael Joner.

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    Transient Defects Caught in the Act

    The anisotropic x-ray diffuse scattering pattern surrounding this Bragg reflection from La1.8Sr2.2Mn2O7 at 125 K provides evidence that Jahn-Teller polarons (football-shaped lattice distortions that follow hopping electrons from site to site) play a role in this material's exotic phase transition from paramagnetic insulator to ferromagnetic metal. This data was used to perform a quantitative three-dimensional structural analysis of transient polaronic distortions.

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    Total Solar Eclipse: August 21, 2017

    This is a photo secured by Dr. Michael Joner in Riverton, Wyoming of the great eclipse of 2017. The image shows the inner corona along with several solar prominences seen near mid-totality. This is the first solar eclipse visible from the continental United States in 38 years. America's next opportunity will be on April 8, 2024 for viewers between Texas and Maine.


17 Mar, Today

7:36 PM

18 Mar, Sunday

7:36 AM

20 Mar, Tuesday

Winter Withdraw Deadline

21 Mar, Wednesday

Colloquium: Eric Homer
4:00 PM

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Recently Published Research

Mike Joner and Michelle Spencer et al. recently published an article titled "Continuum Reverberation Mapping of the Accretion Disks in Two Seyfert 1 Galaxies" in Astrophysical Journal. Click on the image above to read it.

Astronomy Picture of the Day

The Crab from Space: The Crab Nebula is cataloged as M1, the first object on Charles Messier's famous list of things which are not comets. In fact, the Crab is now known to be a supernova remnant, expanding debris from the death explosion of a massive star....

This photograph and Description come from NASA's Astronomy Picture of the Day web site.

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