73 (number) - in Science

In Science

  • The atomic number of tantalum

In astronomy,

Messier object M73, a magnitude 9.0 apparent open cluster in the constellation Aquarius
The New General Catalogue object NGC 73, a barred spiral galaxy in the constellation Cetus
The Saros number of the solar eclipse series which began on 717 BC July and ended on 582 September. The duration of Saros series 73 was 1298.1 years, and it contained 73 solar eclipses.
The number of seconds it took for the OV-099 shuttle to explode after launch.
  • 73 is the length of the Arecibo message, sent to space in search for extraterrestrial intelligence.

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