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Lettris
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. Each square carries a letter. To make squares disappear and save space for other squares you have to assemble English words (left, right, up, down) from the falling squares.
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English dictionary
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Most English definitions are provided by WordNet .
English thesaurus is mainly derived from The Integral Dictionary (TID).
English Encyclopedia is licensed by Wikipedia (GNU).
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Wikipedia
Solar radius
Values of  |
Units |
|---|---|
| 6.955×108 | metres |
| 6.955×105 | kilometres |
| 0.0046491 | AU |
| 432,450 | miles |
| 2.254×10−8 | pc |
Solar radius is a unit of distance used to express the size of stars in astronomy equal to the current radius of the Sun:
The solar radius is approximately 695,500 kilometres (432,450 miles) or about 110 times the radius of the Earth, or 10 times the average radius of Jupiter. It varies slightly from pole to equator due to its rotation, which induces an oblateness of order 10 parts per million. See 1 gigametre for similar distances.
The SOHO spacecraft was used to measure the diameter of the Sun by timing transits of Mercury across the surface during 2003 and 2006. The result was a measured radius of 696,342 ± 65 kilometres (432,687 ± 40 miles).[1]
See also
References
- ^ Emilio, Marcelo; Kuhn, Jeff R.; Bush, Rock I.; Scholl, Isabelle F., "Measuring the Solar Radius from Space during the 2003 and 2006 Mercury Transits", arXiv, http://arxiv.org/abs/1203.4898, retrieved 2012-03-28
- S. C. Tripathy, H. M. Antia (1999). "Influence of surface layers on the seismic estimate of the solar radius". Solar Physics 186 (1/2): 1–11. Bibcode 1999SoPh..186....1T. DOI:10.1023/A:1005116830445.
- T. M. Brown, J. Christensen-Dalsgaard (1998). "Accurate Determination of the Solar Photospheric Radius". Astrophysical Journal Letters 500 (2): L195. arXiv:astro-ph/9803131. Bibcode 1998ApJ...500L.195B. DOI:10.1086/311416.
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