1121–1140 of 1,205 results
Perseid fireball

Hobby-based Q&A

How much space debris falls into Earth's atmosphere every year?

Has anyone ever calculated the combined tonnage of meteroids and space debris falling into our atmosphere yearly? Yes, but it's hard because different methods are needed for different particle sizes. Ground radar and exposed spacecraft surfaces are best for detecting the very smallest bits, whereas photographic surveys have been used…

Astronomy Questions & Answers

How can I spot satellite triads?

While binocular observing from Northern California on August 19, 2004, at 6:33 Universal Time, I picked up a trio of satellites moving from the northwest to overhead and passing through Cygnus. I’m sure they were satellites, as all three turned reddish at the same time before disappearing into Earth’s shadow.…

1998 Pro-Am Workshop

Pro-Am Collaboration

History of Pro-Am Collaboration

Despite decades of observing in relative isolation from one another, professional and amateur astronomers began to come together in the 1980s.

Astronomy & Observing News

Martian Ice: Wide and Deep

Mars Express's onboard radar sounder has spotted vast "glaciers" of ice under the Red Planet's surface.

Astronomy & Observing News

Asteroid Smashup Yields Dust Shower on Earth

Deep-sea sediments provide conclusive evidence that the collision of two large asteroids about 8 million years ago showered Earth with a gentle rain of dusty debris.

Astronomy & Observing News

Hayabusa Hits Paydirt

After several close calls that threatened to end the mission, a Japanese craft has landed on an asteroid and grabbed a sample of its surface.

Astronomy & Observing News

Astro Image in the News: Massive Meteorite Found

A mammoth stony-iron meteorite, found buried on a Kansas farm, ranks among the world's largest.

Astronomy & Observing News

Asteroid Lander Lost in Space

The Japanese spacecraft Hayabusa is ready to grab samples of asteroid Itokawa, but a tiny hopping lander failed to make it to the surface.

Astronomy & Observing News

Hayabusa Closes In on Asteroid Itokawa

Now hovering just 7 km from its target, a Japanese spacecraft is readying to sample the surface — amid growing concerns about the craft's stabilization system.

Astronomy & Observing News

Hayabusa Arrives at Asteroid Itokawa

After a 27-month interplanetary cruise under ion power, Japan's Hayabusa spacecraft finally reaches the small asteroid that will be its home for three months.

Astronomy & Observing News

Orion Telescopes Sold to Imaginova

The headquarters of Orion Telescopes & Binoculars in Watsonville, California.Sky & Telescope photograph by J. Kelly Beatty. In a move that caught the astronomical community by surprise, today Imaginova Corp. announced its purchase of Orion Telescopes & Binoculars. Based in Watsonville, California, Orion is a major manufacturer and distributor of…

Astronomy & Observing News

A Ringside Seat for Huygens's Arrival

Europe's Huygens probe descends to the surface of Titan on January 14th, just as Saturn is at its closest and brightest and ideally placed for observing.

Astronomy & Observing News

Titan: "A World Apart"

Cassini's first brush with Saturn's giant moon revealed a diverse, geologically active landscape.

Astronomy & Observing News

Astronomy Day 2004 Efforts Lauded

This year's celebration of Astronomy Day involved hundreds of organizations around the world and drew huge crowds.

Astronomy & Observing News

Wildfires Threaten Arizona Observatories

A lightning-triggered fire raged up the slopes of Mount Graham and has come within a mile of the unfinished Large Binocular Telescope.

Astronomy & Observing News

Cassini Peeks at Titan

Even when seen from 340,000 kilometers away, Saturn's giant moon has teased Cassini-Huygens scientists by revealing complex, mysterious surface features.

Astronomy & Observing News

Saturn's Magnetic Mysteries

The ringed planet has more than a pretty face: early results from Cassini-Huygens have uncovered strange goings-on in the giant elecctromagnetic bubble that surrounds it.

Astronomy & Observing News

Kalliope's Kin

The number of known binary asteroids continues to grow.

Astronomy & Observing News

Science Teams Await Leonid Storm

Researchers worldwide are looking forward to the new knowledge that they hope to gain from intensive studies of the Leonids' "last hurrah."

Astronomy & Observing News

Spacecraft Readies for Risky Comet Dash

Concerns about camera pointing and fuel reserves will make the Deep Space 1 encounter with Comet Borrelly a risky proposition.Courtesy JPL and Spectrum Astro. The Deep Space 1 probe was never designed to chase comets. It has no shielding to protect its delicate systems from a pummeling of hypersonic dust.…

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