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Flight of Gemini 3

The first manned flight of Project Gemini launched on March 23, 1965 with pioneering astronauts Gus Grissom and John Young. Take a look back!


Apollo 9: Spider flies

Apollo 9 put the lunar landing module Spider through the stresses of spaceflight while orbiting Earth. This documentary looks back with astronauts Jim McDivitt, Dave Scott, and Rusty Schweickart.


Expedition 15 coverage
The Russian Soyuz spacecraft with Expedition 15 cosmonauts Fyodor Yurchikhin and Oleg Kotov, along with tourist Charles Simonyi, fly to the space station.

 Full coverage

STS-61: Fixing Hubble

One of the most daunting yet crucial human spaceflights occurred in December 1993 as the crew of shuttle Endeavour embarked on a mission to repair the Hubble Space Telescope.


STS-51: Crew report

Narrating a highlights film from their STS-51 mission, the astronauts from Discovery's September 1993 flight describe launching an advanced communications satellite and a German telescope.


The Flight of Apollo 7

This documentary looks back at Apollo 7, the first manned flight of the Apollo program. Apollo 7 was designated as the essential engineering test of the spacecraft before the ambitious lunar missions could be attempted.


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Cosmic weight loss: The lowest mass white dwarf
Posted: April 17, 2007

Astronomers have found the lowest mass white dwarf known in our galaxy: a Saturn-sized ball of helium containing only about one-fifth the mass of the Sun. In addition, they have spotted the source of the white dwarf's radical weight-loss plan. An unseen companion, likely another white dwarf, has sucked away much of the tiny white dwarf's material, leaving it a shadow of its former self.

This artist's conception shows the lowest-mass white dwarf known in our galaxy and its companion star, which likely is another white dwarf. The foreground white dwarf underwent a radical weight-loss plan about 500 million years ago, losing mass to its companion. The low-mass white dwarf now weighs only about 17 percent as much as the Sun. Credit: David A. Aguilar (CfA)
"This star is bizarre," said Warren Brown of the Harvard-Smithsonian Center for Astrophysics. "It takes extraordinary circumstances to make such a low mass white dwarf."

When a Sun-like star ages and dies, it becomes a white dwarf. The newfound white dwarf, with the unwieldy designation of SDSS J091709.55+463821.8 (hereafter J0917+46) lies about 7,400 light-years from Earth near the border of the constellations Lynx and Ursa Major. Where a typical white dwarf holds about half a Sun's worth of material, the newfound white dwarf contains only a fraction of that mass.

"Our white dwarf is skinny in terms of mass, yet it looks fat in terms of its physical size," stated first author Mukremin Kilic of Ohio State University. "It's about nine times bigger than a typical white dwarf in diameter."

When the astronomers first found J0917+46, they predicted that it must have an unseen companion that had aided its weight loss. A subsequent radial velocity search, which looked for signs that the white dwarf wobbled when tugged by a companion's gravity, confirmed the prediction. The astronomers ruled out the possibility that the companion is either a low-mass main sequence star or a black hole. It must be either another white dwarf or a neutron star, with a white dwarf being the more likely candidate.

"No star is old enough to produce such an extremely low-mass white dwarf by itself," explained Brown. "Therefore, we knew that mass must have been stripped from the white dwarf by a companion."

"Finding the companion means that stellar evolution theories have passed a major test," added co-author Scott Kenyon of the Smithsonian Astrophysical Observatory. "The fact that the companion is a more massive white dwarf or neutron star is also consistent with theory."

The team also described the oddball pair's history. This binary system began with one star about twice the mass of the Sun and a second star slightly less massive than the Sun. The more massive star was the first to evolve, becoming a white dwarf weighing perhaps one-third as much as the Sun. Ten billion years later, its companion became another white dwarf. In each step, the puffed-up outer layers of the evolving star enveloped the companion, causing friction that moved the two stars closer together. They now orbit each other every 7.6 hours at a distance of about 650,000 miles and a stunning speed of 335,000 miles per hour.

"The relation between our white dwarf and its companion is like a cosmic marriage in which both people have to give a lot," said Kilic. "Two stars start out close to each other. One of them engulfs the other (like a hug) and gives continuously (losing mass), and they get closer. Then the other star evolves and becomes a giant and engulfs the first star (hugging back) and now it has to give a lot, or lose a lot of mass. They get closer and closer and end up dancing continuously."

The astronomers predict that the two white dwarfs eventually will merge. However, that merger will not take place for 10 billion years or more.

Key observations were made with the MMT Observatory in Arizona, which is operated jointly by the Smithsonian Astrophysical Observatory and the University of Arizona.