- A-type main-sequence star (Wikipedia)
An A-type main-sequence star (AV) or A dwarf star is a main-sequence (hydrogen burning) star of spectral type A and luminosity class V (five). These stars have spectra defined by strong hydrogen Balmer absorption lines. They measure between 1.4 and 2.1 solar masses (M☉) and have surface temperatures between 7,600 and 10,000 K. Bright and nearby examples are Altair (A7), Sirius A (A1), and Vega (A0). A-type stars do not have convective zones and thus are not expected to harbor magnetic dynamos. As a consequence, because they do not have strong stellar winds, they lack a means to generate X-ray emissions.
- Hastings Bridge (Wikipedia)
The Hastings Bridge is a free standing tied-arch bridge that spans the Mississippi River in Hastings, Minnesota, United States. It was designed by Parsons and was built in 2013 by Lunda Construction Company for $119,830,000. The Hastings Bridge replaces the former Hastings High Bridge, which was built in 1951 and demolished in 2013 when the replacement bridge was completed. The Hastings High Bridge had been scheduled to be torn down and replaced in 2019, but after the I-35W bridge collapse in Minneapolis, the MNDOT re-prioritized the replacement and construction of the new bridge started in 2010.
