Weather Forecast



December 24, 2017
Kepler-90 is a 14th magnitude star in Draco near the border with Cygnus, a.k.a. the Northern Cross. Courtesy photo / Stellarium
Artificial intelligence helps nail 8-planet solar system like our own
December 24, 2017 - 11:53am
December 10, 2017
This NASA/ESA Hubble Space Telescope image reveals the Cosmic Snake, a distant galaxy peppered with clumpy regions of intense star formation that appear warped by the effect of gravitational lensing. This giant arc-like galaxy is actually behind the huge galaxy cluster MACSJ1206.2-0847, but thanks to the cluster’s gravity, we can see it from Earth.
Behold the cosmic snake
December 10, 2017 - 8:47am
December 3, 2017
The human nose is practically useless for astronomy. Photo illustration by Bob King /
AstroBob: What does a comet smell like?
December 3, 2017 - 8:49am
October 22, 2017
Astronomers not only saw gravitational waves and gamma rays from the event, but also visible and near-infrared light as shown in these images made with the Swope and Magellan telescopes. Credit: 1M2H/UC Santa Cruz and Carnegie Observatories/Ryan Foley
AstroBob: Neutron stars' death merger rattles the fabric of spacetimes
October 22, 2017 - 3:57pm
September 10, 2017
In this view, we’re looking straight down from above the Milky Way galaxy’s plane at several of its spiral arms including the Orion Arm, home to Orion and our solar system. Credit: R. Hurt
AstroBob: It's September, time for my Orion fix
September 10, 2017 - 12:43pm
September 3, 2017
In this artist's depiction, NASA’s Cassini spacecraft is shown during its Sept. 15 plunge into Saturn’s atmosphere. Cassini will use its thrusters to keep its antenna pointed at Earth for as long as possible while sending back unique data about Saturn’s atmosphere. Credit: NASA/JPL-Caltech
ASTROBOB: T-minus 12 days: Cassini keeps opening our eyes
September 3, 2017 - 8:30am
July 9, 2017
Time exposure of an Iridium 75 flare from 2010. The star Vega is to the right and below the trail. Bob King /
AstroBob: Iridium satellites keep fireworks coming -- but not forever
July 9, 2017 - 5:37pm
June 25, 2017
The most common firefly of eastern North America is Photinus pyralis, or the common eastern firefly. This is most of us see in own backyards at night. Bob King /
AstroBob: Fireflies - green sparks in the dark
June 25, 2017 - 11:48am
June 4, 2017
This illustration shows the final stages in the life of a supermassive star that fails to explode as a supernova but instead implodes under gravity to form a black hole.
AstroBob: Giant star becomes a black hole right before our eyes
June 4, 2017 - 7:14pm
May 28, 2017
Astronaut Jack Fischer waves while attached to the Destiny laboratory during a spacewalk to replace a failed computer relay box and install a pair of wireless antennas last week. Credit: NASA
AstroBob: Observing alert -- space station marathon is underway
May 28, 2017 - 6:06pm
April 9, 2017
Astro Bob: Spring nights sweeter with the space station
April 9, 2017 - 10:18am
April 2, 2017
A future lunar base, perhaps constructed using 3-D printing devices, will have to be heated during the long lunar night. Covering it with lunar soil, called regolith, would help to insulate the structure against extremes of heat and cold. Credit: ESA/Foster and Partners
Astro Bob: How moon colonists might survived the frigid lunar night
April 2, 2017 - 10:22am
March 26, 2017
The slow cyclic wobble of Earth’s axis called precession resembles the motion of a top slowing down only the Earth’s not slowing down – it repeats the circle every 25,800 years. The wobble causes the pole star to change and the Sun to moves westward along the zodiac. Earth and Planetary Magnetism Group ETH-Zurich
AstroBob: Salvador Dali would love these constellations
March 26, 2017 - 7:00am
March 12, 2017
Earth’s counterclockwise motion around the sun (to the left or east) causes the constellations to drift to the right (west) during the year. The effect is subtle — stars rise in the east four minutes earlier each night because of our planet’s travels — but the minutes add up, creating a complete turnover in the constellations every year. Bob King /
AstroBob: Welcome Arcturus!
March 12, 2017 - 6:12pm
March 5, 2017
A brilliant fireball breaks up in the atmosphere. Visible light and radio waves given off by a bright meteor may be translated by common materials into hissing sounds some hear at the sight of the event. John Chumack
AstroBob: A new take on why we hear meteors
March 5, 2017 - 3:07pm