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News for Norther Colorado and the world

Friday, April 18, 2014

Posts Tagged ‘Moon’

Astronomy Picture of the Day

Astronomy Picture of the Day

Explanation: The dark, inner shadow of planet Earth is called the umbra. Shaped like a cone extending into space, it has a circular cross section most easily seen during a lunar eclipse. For example, last Saturday the Full Moon slid across the southern half of Earth's umbral shadow, entertaining moonwatchers around much of the planet. In the total phase of the eclipse, the Moon was completely within the umbra for 51 minutes.       The Umbra of Earth  Image ... Full Story

Astronomy Picture of the Day

Astronomy Picture of the Day

  It's Raining on Titan Illustration Credit & Copyright: David A. Hardy (AstroArt) Explanation: It's been raining on Titan. In fact, it's likely been raining methane on Titan and that's not an April Fools' joke. The almost familiar scene depicted in this artist's vision of the surface of Saturn's largest moon looks across an eroding landscape into a stormy sky. That scenario is consistent with seasonal rain storms temporarily darkening Titan's surface along the moon's ... Full Story

Astronomy Picture of the Day

Astronomy Picture of the Day

    Io in True Color Credit: Galileo Project, JPL, NASA Explanation: The strangest moon in the Solar System is bright yellow. This picture, an attempt to show how Io would appear in the "true colors" perceptible to the average human eye, was taken in 1999 July by the Galileo spacecraft that orbited Jupiter from 1995 to 2003. Io's colors derive from sulfur and molten silicate rock. The unusual surface of Io is kept very young by its system of active volcanoes. The ... Full Story

Astronomy Picture of the Day

Astronomy Picture of the Day

    Mare Orientale Credit: NASA / GSFC / Arizona State Univ. / Lunar Reconnaissance Orbiter Explanation: Shaped like a target ring bull's-eye, the Mare Orientale is one of the most striking large scale lunar features. Located on the Moon's extreme western edge, it is unfortunately difficult to see from an earthbound perspective. Still, this mosaic of the multi-ring impact basin, the youngest of the large lunar basins shows off intriguing details (full resolution mosaic), ... Full Story

Sky Tonight—January 27, Saturn starts retrograde on

Sky Tonight—January 27, Saturn starts retrograde on January 27

Courtesy of EarthSky A Clear Voice for Science Visit EarthSky at www.EarthSky.org Starting today – on January 27, 2011 – Saturn will begin to go in a retrograde or westward direction in front of the constellation Virgo. That is a signal that the best time to see Saturn in 2011 has begun. Give me 5 minutes, and I’ll give you Saturn in 2011 The planet Saturn – a golden world that appears to shine steadily on the sky’s dome – is rising in the east around 11 p.m. now. ... Full Story

EarthSky Tonight—Oct. 31, Arcturus is a Halloween

EarthSky Tonight—Oct. 31, Arcturus is a Halloween ghost of the summer sun

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Every Halloween – and a few days before and after – the brilliant star Arcturus sets at the same time and on the same spot on the horizon as the summer sun. What’s more, this star rises at the same time and at the same place on the horizon as the sun does during the dog days of summer. So – around Halloween – it is as if Arcturus is a fainter ghost of the summer sun. At mid-northern latitudes, Arcturus now ... Full Story

EarthSky Tonight—Oct. 30, As Halloween approaches,

EarthSky Tonight—Oct. 30, As Halloween approaches, find the Ghoul Star of Perseus

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org As Halloween approaches, try looking for the star Beta Persei, otherwise known as Algol in the constellation Perseus. This star’s proper name comes from the Arabic for head of the ghoul, or head of the demon. This star is known to vary in brightness over a regular time interval. The cycle lasts exactly 2 days, 20 hours and 49 minutes. All the while, the star remains visible to the eye. Algol’s brightness variations are ... Full Story

EarthSky Tonight—October 21, Full Hunter’s Moon of

EarthSky Tonight—October 21, Full Hunter’s Moon of 2010 tomorrow

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Tonight’s moon is only a prelude to the full Hunter’s Moon that will grace North American skies tomorrow – on Friday evening, October 22. Nevertheless, the moon looks plenty full tonight, too, as it parades across the sky from dusk until dawn. The moon will reach the crest of its full phase tomorrow at precisely 8:46 p.m. Central Time (9:46 p.m. Eastern Time, 7:46 p.m. Mountain Time, 6:46 p.m. Pacific ... Full Story

EarthSky Tonight-June 24: Earth passes between sun and

EarthSky Tonight-June 24: Earth passes between sun and Pluto tomorrow

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Pluto – the former planet – comes to opposition on June 25, at 19:00 Universal Time. That is when we on Earth pass more or less between the sun and Pluto, so that this distant world is now opposite the sun in our sky. Of course, in Pluto’s case, it is not exactly opposite since the orbit of Pluto is inclined to the plane of the solar system by 17 degrees. That is a greater inclination than the orbits of Mercury, ... Full Story

EarthSky Tonight-June 23: Waxing gibbous moon passes

EarthSky Tonight-June 23: Waxing gibbous moon passes near Scorpion’s Heart

Courtesy of EarthSky A Clear Voice for Science www.EarthSky.org Tonight the moon returns to the constellation Scorpius the Scorpion. The brightest star in the immediate vicinity is Antares, whose name means “like Mars,” because of its similar reddish hue. If you remember your Greek mythology, or perhaps episodes of Xena: Warrior Princess, Ares is the god of war, the counterpart to the Roman god Mars. You can perform the color comparison yourself, because the planet Mars lies in the ... Full Story

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