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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
31 min 28 sec ago
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
February 19, 2017
The sun’s fiery conveyor belts skim the surface of the sun, sweeping up the magnetic fields of old, dead sunspots. The "corpses" are dragged down at the poles to a depth into the solar depths, where they’re recharged by the sun’s rotation. Reincarnated, they become buoyant and float back to the surface to make new sunspots! NASA
AstroBob: Ride the roller coaster to solar minimum
February 19, 2017 - 2:04pm
February 12, 2017
Use this photo of Saturn taken by the Hubble Space Telescope to get oriented on which ring is which. Credit: NASA/ESA
AstroBob: Saturn's got a whole new groove
February 12, 2017 - 1:14pm
September 24, 2015
NORTHLAND STARGAZING: Late-rising stargazers need not apply
September 24, 2015 - 7:09pm
August 27, 2015
NORTHLAND STARGAZING: Algol, planets, and Aldebaran eclipsed
August 27, 2015 - 6:42pm
July 23, 2015
NORTHLAND STARGAZING: New Horizons visits Pluto on Bastille Day
July 23, 2015 - 7:27pm
May 28, 2015
Northland Stargazing: Hubble is 25, Regulus a few million
May 28, 2015 - 7:24pm
February 26, 2015
Northland Stargazing: Open clusters, saints' days, and the vernal equinox
February 26, 2015 - 11:56pm
January 22, 2015
Northland Stargazing: Jupiter rules the night
January 22, 2015 - 11:46pm
December 25, 2014
Northland Stargazing: Jupiter rules the night
December 25, 2014 - 11:09pm
November 3, 2014
Fire in the sky: Meteor sightings Sunday has area abuzz
November 3, 2014 - 9:25pm
October 23, 2014
Northland Stargazing: Three planets, some constellations, and two showers:
October 23, 2014 - 11:27pm
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