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News for Norther Colorado and the world

Thursday, March 5, 2015

‘Earth & Sky’ Archives

Earthsky Tonight—July 27, Saturn, Mars, Venus –

Earthsky Tonight—July 27, Saturn, Mars, Venus – close pairing of Regulus and Mercury

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org The planets Saturn, Mars and Venus are still in the west after sunset, to the delight of stargazers across the globe. In addition, the planet Mercury –our solar system’s innermost world – teams up with Regulus around now in the same part of the sky. Regulus is the brightest star in the constellation Leo the Lion. Tonight, Mercury and Regulus form the year’s closest pairing of a planet with a first-magnitude star. Look ... Full Story

Earthsky Tonight—July 26, The ‘forgotten’

Earthsky Tonight—July 26, The ‘forgotten’ zodiacal constellation

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org The faint constellation Ophiuchus the Serpent Bearer appears in the southern sky at nightfall, and descends into the southwest sky as evening deepens into late night. Look for Ophiuchus above the bright ruddy star Antares, the brightest in the constellation Scorpius the Scorpion. Ophiuchus’ brightest star – called Rasalhague – highlights the head of Ophiuchus and is nowhere as bright as Antares, the star that depicts ... Full Story

Earthsky Tonight—July 25, Full moon falls on July 25

Earthsky Tonight—July 25, Full moon falls on July 25 in the Americas

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org To the casual observer, the moon looks full for up to two or three days in a row each month. Astronomically speaking, however, the full moon has no actual duration, but occurs at a well-defined instant. The moon is astronomically full when it stands 180 degrees opposite the sun in Earth’s sky. That happens this evening – on Sunday, July 25 – at 8:36 p.m. Central Time (9:36 p.m. Eastern Time, 7:36 p.m. Mountain Time and ... Full Story

Earthsky Tonight—July 24,Why the hottest weather is

Earthsky Tonight—July 24,Why the hottest weather is not on the longest day

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Look westward at nightfall to see three planets in the July evening sky. In their order of brightness, these worlds are Venus, Saturn and Mars. Venus outshines Saturn and Mars by leaps and bounds. Venus is the first “star” to pop into view after sunset. If you keep watching the western sky into early August, you will see these three form a tight cluster in the west after sunset. EarthSky’s meteor guide for ... Full Story

Earthsky Tonight—July 23, Jupiter appears to stop,

Earthsky Tonight—July 23, Jupiter appears to stop, then change direction

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Jupiter may be a giant planet, but compared to Earth it moves like an oxcart in the race around the sun. The Earth’s average speed is about 67,000 miles an hour, while Jupiter lumbers along at less than half that speed, or about 29,000 miles an hour. Because of its faster speed and shorter distance to go around its orbit, our Earth laps Jupiter about once every 13 months. It is a lot like a fast racecar in the inner track ... Full Story

Earthsky Tonight—July 22, Shaula and Lesath near the

Earthsky Tonight—July 22, Shaula and Lesath near the moon

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org If you can see Antares and the moon – and if your sky is unobstructed in the direction toward the southern horizon – you might be able to pick out a graceful looping stream of stars, despite the moonlit glare. These stars represent the Scorpion’s curved Tail. They are the reason Scorpius has been identified as a Scorpion by stargazers. Now notice two stars in the Scorpion’s Tail, Shaula and Lesath. Together, these ... Full Story

Earthsky Tonight—July 21,Moon and Antares even

Earthsky Tonight—July 21,Moon and Antares even closer today

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org The southernmost constellation of the Zodiac – Scorpius the Scorpion – lurks low in the evening sky tonight. You can recognize it easily because the moon is moving through this part of the sky. You will find tonight’s moon near Antares, the star that represents the Scorpion’s Heart. From the perspective of mid-northern latitudes, the Scorpion comes up in the southeast in evening twilight now and skitters near the ... Full Story

Earthsky Tonight—July 20, Moon and Antares cross the

Earthsky Tonight—July 20, Moon and Antares cross the sky together

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org There’s a bright star to the east (left) of tonight’s waxing gibbous moon. It’s Antares, often called the Heart of the Scorpion in the constellation Scorpius. You can’t miss this star because it’s bright and reddish in color. Because it’s low in the sky as seen from the northern hemisphere, people in this part of the world often notice that Antares twinkles a lot. You’ll find the moon to the west (right) ... Full Story

Earthsky Tonight—July 19, Summer Triangle: Altair

Earthsky Tonight—July 19, Summer Triangle: Altair and Aquila the Eagle

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org In the east after dark, near the horizon, Altair, the brightest star in the constellation Aquila, the Eagle, springs into view. This is the bottom star of the Summer Triangle. The Great Rift of the Summer Milky Way passes through the Summer Triangle, between the stars Vega and Altair. Thought the Great Rift and the Milky Way will be hard to see tonight because of the waxing gibbous moon. In dark skies in late July and the ... Full Story

Earthsky Tonight—July 18,Moon moves past Spica,

Earthsky Tonight—July 18,Moon moves past Spica, approaches celestial ‘Gateway’

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Can you see that the moon is farther from Spica tonight than it was last night? The moon is shifting farther and farthest east, with respect to the stars, each day. The moon always moves toward the east on our sky’s dome. This motion is a translation on our sky’s dome of the moon’s orbit around Earth. You can observe the moon’s orbital motion from one night to the next by watching the moon’s location with respect ... Full Story

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