Special Topic: Fred Whipple’s Comet Model
Once it had become clear that comets are bona fide members of the solar system just as planets and asteroids are, the question then becomes just what their physical nature might be. While they may appear to be fairly large in our nighttime sky, the fact that background stars shine through their tails and their …
Whipple’s Shield protected Giotti
When the Giotti spacecraft launched on its voyage to explore Halley’s Comet in 1985, it was an invention by the son of an Iowa farmer decades earlier that allowed the mission to be successful. The most difficult problem of the mission to overcome was how to ensure that Giotto survived long enough to snap its …
SpaceX Crew Dragon closing in on first launch with astronauts aboard
The United States is drawing closer to launching humans from American soil once again with the arrival of the newest SpaceX Crew Dragon spacecraft at NASA’s Kennedy Space Center in Florida. The capsule is slated to launch with a crew of two NASA astronauts on the Demo-2 mission sometime this spring, marking the first time …
Finalists selected for naming NASA’s next Mars rover
After conducting a nationwide contest where kindergarten through 12th grade students across the United States submitted essays to “Name the Rover,” NASA has selected nine candidate names as finalists to come up with a fitting name for NASA’s Mars 2020 rover. The nine candidate names were selected from more than 28,000 essays submitted since the …
This Week in History: February 23-29
FEBRUARY 23, 1988: David Levy obtains the final visual observation of Comet 1P/Halley during its 1986 return, using the 1.5-meter telescope at Catalina Observatory in Arizona. The comet was located 8.0 AU from the sun and appeared at 17th magnitude. FEBRUARY 24, 1979: The U.S. Defense Department satellite P78-1 is launched from Vandenberg Air Force …
Comet of the Week: Whipple-Fedtke-Tevzadze 1942g
Perihelion: 1943 February 6.72, q = 1.354 AU The name of Fred Whipple is legendary in cometary astronomy. He spent several decades as an astronomer and professor at Harvard University, and is best known for developing what he called the “icy conglomerate” model of a comet’s nucleus (more commonly referred to as the “dirty snowball”) …