Adriaan van Maanen (March 31, 1884, Sneek – January 26, 1946, Pasadena) was a Dutch–American astronomer.
Van Maanen, born into a well-to-do family in Friesland, studied astronomy at the University of Utrecht (earning his Ph.D. in 1911) and worked briefly at the University of Groningen. In 1911, he came to the United States to work as a volunteer in an unpaid capacity at Yerkes Observatory. Within a year he got a position at the Mount Wilson Observatory, where he remained active until his death in 1946.
He discovered Van Maanen's star.
He is well known for his astrometric measurements of internal motions in spiral nebulae. Being of the belief that nebulae were local, stellar and gaseous systems that existed in our galaxy, his measurements came to be at odds with Edwin Hubble's discovery that the Andromeda Nebula and other spiral nebulae were extragalactic objects. The speed at which he calculated the nebulae to rotate would, if Hubble were correct as to their extragalactic nature, have had their Cepheid stars moving at speeds faster than that of light. In 1935, it was decided that since Hubble's calculations of extragalactic Cepheid distances were correct, ergo van Maanen's astrometric measurements had to be incorrect.
Read more about Adriaan Van Maanen: Known For Faulty Results
Famous quotes containing the word van:
“The first day that we landed upon that fatal shore
The planters they came round us full twenty score or more,
They rank’d us up like horses, and sold us out of hand
Then yok’d us unto ploughs, my boys, to plow Van
Dieman’s Land.”
—Unknown. Van Dieman’s Land (l. 9–12)