NASA's upcoming service call on the Hubble Space Telescope won't happen till late September or early October.
Eighteen years ago today, astronauts aboard the Space Shuttle Discovery deployed the Hubble Space Telescope. And what an 18 years it's been!
In a fascinating article in the June 2008 issue of Sky & Telescope, astronomer Douglas L. Welch (McMaster University, Canada) explains how amateur astronomers can help professionals observe light from supernova explosions that rocked our Milky Way Galaxy hundreds of years ago. The key is to use CCD imaging to search for light echoes:...
A dispute between rival telescope companies has ended with an amicable settlement and a clear definition of "Ritchey-Chrétien."
Astronomers have found some pulsars that appear unusually massive, calling into question our understanding of neutron-star interiors.
A unique example of gravitational lensing in the universe gives clues to the distribution of dark matter in galaxies.
Astronomers have found several young star clusters that don't belong to any particular galaxy.
Preparations are well under way for the August 2008 servicing mission to the Hubble Space Telescope.
The United Nations' General Assembly has formally proclaimed 2009 the International Year of Astronomy.
The American Astronomical Society (AAS) is now accepting nominations for the Chambliss Amateur Achievement Award.
A newly discovered dwarf galaxy in Hercules isn't like the millions of other "dwarf spheroidals" known in the universe. It's cigar shaped.
Using a double dose of new technology, astronomers have given an old telescope the sharpest vision ever achieved besting even that of the Hubble Space Telescope.
Amateur observations of variable star PQ Andromedae are needed on September 11-12, 2007, to ensure a successful Hubble campaign.
A suspected dwarf nova is undergoing its first observed outburst and had reached 9th magnitude as of September 5, 2007. More observations are needed.
New high-resolution images of dwarf galaxy IC 10 in Cassiopeia may help resolve an enduring mystery about this star-forming powerhouse.
Please help us accurately map the edge of the Moon by timing occultations of stars during the August 28, 2007, total lunar eclipse.
Sky & Telescope's October 2007 issue introduces a new format and design but remains true to its history and mission.
On Tuesday morning, August 21, 2007, observers across much of North America should watch for a possible occultation by asteroid 146 Lucina's satellite.
Astronomers have found massive, luminous infrared galaxies 12 billion light-years away. It's not at all clear how they got there.
On August 8, 2007, variable-star observer Hiroshi Abe discovered a 9th-magnitude nova in Vulpecula. The AAVSO seeks your observations.
Astronomers using a battery of ground- and space-based telescopes have stumbled upon the most massive galaxy smashup ever seen.
A spirited bidding war is now under way for two precious artifacts: a prototype 13-mm Nagler eyepiece and Steve O'Meara's Tele Vue Genesis refractor.
New images from the Hubble Space Telescope show parts of the Veil Nebula in Cygnus in unprecedented detail.
A widely read columnist thinks that a reader's question about all the lost stars is "too funny." Tell us your thoughts.
Two precious artifacts a prototype Nagler eyepiece and Steve O'Meara's Tele Vue Genesis telescope will be sold to the highest bidders in late July 2007.