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August 17, 2017
A pinhole projector using two paper plates saves your eyeballs from the glare of the solar eclipse. Alexandra Floersch / The Forumplay button
3 easy ways to view the eclipse while protecting your eyes
August 17, 2017 - 9:34am
Path of the eclipse: When and where to get the best view
August 17, 2017 - 9:27am
Path of the eclipse: When and where to get the best view
August 17, 2017 - 9:27am
August 13, 2017
A student looks at the partially eclipsed sun in northern England on March 20, 2015 using a pair of eclipse glasses. Credit: Reuters
AstroBob: How dark will it get during total eclipse?
August 13, 2017 - 8:30am
August 6, 2017
Earth has several different layers: crust, mantle and core. If you were to somehow safely descend into the core, you’d be weightless there because all the matter around you would tug on you equally. As you ascended back to the surface, you’d gradually return to your normal weight. Credit: NASA
AstroBob: If you dug a deep enough hole, would end up in China?
August 6, 2017 - 1:29pm
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 / rking@duluthnews.com
AstroBob: Fireflies - green sparks in the dark
June 25, 2017 - 11:48am
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 16, 2017
This artist’s concept depicts the early Martian environment (right) — believed to contain liquid water and a thicker atmosphere — versus the cold, dry environment seen at Mars today (left). NASA’s Mars Atmosphere and Volatile Evolution (MAVEN) has been orbiting the Red Planet for more than two years, studying its upper atmosphere, ionosphere and interactions with the sun and solar wind. NASA’s Goddard Space Flight Center
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Astro Bob: How Mars turned nasty cold
April 16, 2017 - 9:21am
April 9, 2017
Astro Bob: Spring nights sweeter with the space station
April 9, 2017 - 10:18am
April 6, 2017
Jupiter. Contributed photo.
Planet Jupiter comes in for a close-up, will be bright Friday night
April 6, 2017 - 6:58pm
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 / rking@duluthnews.com
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
February 26, 2017
Luna 17, the spacecraft that carried the Lunokhod 1 rover to the surface, is the shiny platform seen above center in this photo taken by NASA’s Lunar Reconnaissance Orbiter. You can make out the rover tracks around the lander including the “doughnuts” the rover made to test its turning abilities. NASA / GSFC / Arizona State University
AstroBob: Can you see the Russian landers, rovers on the moon? Yes!
February 26, 2017 - 1:08pm