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A crecent moon (L) and the planets Venus (C, bottom) and Jupiter (R) are seen in a rare alignment over the Manhattan skyline on Dec. 1, 2008 from New York.

How to See the Venus-Jupiter Conjunction on Monday

The distant planets will appear close together just before sunrise

Farewell to all that: An artist's rendering of Cassini's final approach to Saturn

Watch Live: NASA's Cassini Spacecraft Self-Destructs in 'Grand Finale' on Saturn

It will make its final plunge into Saturn on Friday morning

Farewell to the Cassini Probe, America's Emissary to Saturn

An appreciation of one of NASA's finest ships

These Stunning Photos of Saturn Are a Beautiful Goodbye From NASA’s Cassini Probe

Eight striking images Cassini captured of the ringed planet

A view of Russia's Mir Space Station backdropped against a cloud-covered Earth. One of the solar array panels on the Spektr Module shows damage incurred during the impact of a Russian unmanned Progress re-supply ship which collided with the space station June 25, 1997.

Episode 8 of the Podcast 'Countdown': Collision in Space

Nothing stands still in orbit. To stop is to die — or at least to come plum...

Nothing stands still in orbit. To stop is to die — or at least to come plummeting back to the ground. That's the nature of the forces that keep spacecraft flying, with their altitude and...

Voyager 1 and its identical sister craft Voyager 2 were launched in 1977 to study the outer Solar System and eventually interstellar space.

'A Kind of Immortality.' Carl Sagan's Widow Ann Druyan on Voyager 1's 40th Anniversary

Forty years have passed since Voyager 1 launched

In this handout photo provided by the European Space Agency (ESA), ESA astronaut Luca Parmitano poses for photographs after returning to earth in the Soyuz TMA-09M spacecraft in the Kazakh Steppe region on Novemeber 11, 2013 in Kazakhstan.

Episode 7 of the Podcast 'Countdown:' The Strange Case of the Drowning Astronaut

The most unlikely crisis ever faced in space