The Apennine Mountains will stand out boldly tonight (Oct. 25) on the 9-day-old moon. All you need to see them is a pair of binoculars and a partly cloudy sky. The mountain range defines the southeastern "shore" of Mare Imbrium, the Sea of Showers. You'll also notice the prominent craters Copernicus (58 miles diameter) and Plato (68 miles). (Bob King)

Astro Bob Oct 25th 2020 - 1pm

Astro Bob: Go Climb a Mountain ... on the Moon!

Tonight we'll head up to the Apennine Mountains for a sweeping vista of Mare Imbrium, site of one of the moon's greatest cataclysms.

Uranus is the third largest planet after Jupiter and Saturn. Its atmosphere is mostly hydrogen and helium, but a small amount of methane present tints the globe a pretty shade of aqua. (NASA images)

Astro Bob Oct 20th 2020 - 8pm

Astro Bob: Trick or treat! Uranus at opposition on Halloween

This false-color, composite shows the Orionid meteor shower over Huntsville, Alabama in Oct. 2009. They peak again on the morning of Oct. 21. NASA

Astro Bob Oct 20th 2020 - 9am

Astro Bob: Sparks fly from Orion on Oct. 21-22; watch NASA probe sample an asteroid Oct. 20

In this photo the zodiacal light is the tall, diffuse shaft of light that angles up from beneath the constellation Leo. Bright Venus glares near its base, and the Beehive star cluster appears father up its narrow end. I made the picture on Oct. 16 two hours before sunrise (5:30 a.m.) from Duluth, Minn. facing east over Lake Superior. (Bob King for the News Tribune)

Astro Bob Oct 18th 2020 - 1pm

Astro Bob: October mornings with the zodiacal light / Starlink satellite news

A thin layer of cells at the base of each leaf stem literally cuts the leaf off from the tree. Gravity assists in the process. (Bob King for the Duluth News Tribune)

Astro Bob Oct 14th 2020 - 1pm

Astro Bob: From falling leaves to black holes, gravity works in wondrous ways

Stars in the northern sky describe circular arcs around the North Star in this 45-minute time exposure. Stars closer to Polaris than your latitude circle it without setting and are called circumpolar. Bob King

Astro Bob Oct 13th 2020 - 12am

ASTRO BOB: Oct. 13 dawn celestial trio / Why do some stars never set?

Mars can help us find the variable star Mira in the constellation Cetus the sea monster. The two are currently just a fist and a half apart. Mira is a pulsating variable star that physically expands and contracts, brightening and fading over a period of 332 days. (Bob King)

Astro Bob Oct 11th 2020 - 7pm

ASTRO BOB: Mars meets monstrous, mutable Mira

A poplar tree in full fall regalia frames the waning gibbous moon the morning of Oct. 7, 2020. (Bob King / For the News Tribune)

Astro Bob Oct 7th 2020 - 2pm

ASTRO BOB: Why does the moon shine in the daytime?

Mars leaves a bright glitter path on Lake Superior near Duluth, Minn. on a recent night. (Bob King for the Duluth News Tribune)

Astro Bob Oct 6th 2020 - 10am

Astro Bob: Behold Mars! Red planet closest and brightest until 2035

You can't miss the twinkly, red-orange gleam of Arcturus at dusk in the western sky. Physically and culturally it's one of the most interesting stars in the sky. (DSS2 / Aladin Sky Atlas)

Astro Bob Oct 5th 2020 - 1pm

Astro Bob: Making a cosmic connection with Arcturus

Only the spacecraft's collector head at the end of its robotic arm will touch the asteroid's surface during sample gathering. NASA

Astro Bob Oct 1st 2020 - 3pm

Astro Bob: Daring asteroid mission to take a bite out of Bennu on Oct. 20

The waning gibbous moon will pass under the planet Mars on the night of Oct. 2-3. Observers in parts of the southern hemisphere will see the moon occult the Red Planet. Stellarium

Astro Bob Sep 29th 2020 - 5pm

Astro Bob: Harvest moon meets Mars in stunning Oct. 2 conjunction

A huge aurora fills the northern sky during a major storm on May 7, 2016. (Bob King for the Duluth News Tribune)

Astro Bob Sep 27th 2020 - 3pm

Astro Bob: Pants on! A promising aurora forecast for Sept. 27-29

Saturn (left) and Jupiter have been a familiar sight in the southern sky this summer and fall. Keep an eye on them. In the weeks ahead Jupiter will close the gap. (Bob King for the Duluth News Tribune)

Astro Bob Sep 23rd 2020 - 3pm

Astro Bob: Watch Jupiter and Saturn slow dance to their squeaky-tight 'Great Conjunction'

A sugar maple leaf transitions from summer to fall earlier this week. (Bob King for the Duluth News Tribune)

Astro Bob Sep 22nd 2020 - 3pm

Astro Bob: Summer scurries before fall

Astro Bob Sep 20th 2020 - 6pm

Watch the Scorpion's Eye Blink! Moon Occults Acrab Sept. 21

Astro Bob Sep 18th 2020 - 9pm

Crescent Moon Returns With a Bellyful of Earth

Astro Bob Sep 17th 2020 - 5pm

As Fall Approaches, Space Station Brightens Twilight Skies

alse color photo by JAXA / ISAS / DARTS / Damia Bouic
Dark higher-altitude clouds obscure the brighter mid-altitude clouds in this image of Venus taken by an infrared camera on board Japan's Akatsuki Venus Climate Orbiter. Phospine gas detected in the temperate mid-altitude clouds is teasing scientists with a possible signature for life.

Astro Bob Sep 15th 2020 - 6pm

Venus a Haven for Life? New Discovery Hints at Cloud-Loving Microbes

Astro Bob Sep 14th 2020 - 4pm

Smoke Blankets the Sky From Coast to Coast

Dawn arrived in orbit around Ceres back on March 6, 2015. Ceres is seen from NASA's Dawn spacecraft on March 1, just a few days before the mission achieved orbit around the previously unexplored dwarf planet. The image was taken at a distance of about 30,000 miles (about 48,000 kilometers).
Credits: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA

Astro Bob Sep 13th 2020 - 4pm

Dwarf Planet Ceres Plies September Skies

Venus and the Beehive M44 Sept. 11, 2020 Bob King

Astro Bob Sep 11th 2020 - 4pm

Stung by Wonder — See Venus Skirt the Beehive Cluster Sept. 12-14

Astro Bob Sep 9th 2020 - 7pm

The Veil Nebula — Is There a More Astonishing Sight in the Nighttime Sky?

Neptune Earth compared. NASA

Astro Bob Sep 8th 2020 - 6pm

Tune Into Neptune Tonight

Moon Mars conjunction / Bob King

Astro Bob Sep 6th 2020 - 5pm

Tips on Photographing Bright Moon-Planet Conjunctions

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