Tag: planets

Blue and Green with Envy

In this week’s discussion topic, I attempt to answer the question “Why are Uranus and Neptune distinctly bluer than Jupiter and Saturn?”

On Uranus and Neptune, the methane absorbs red, orange and yellow light, reflecting back the blue.  In contrast, Jupiter and Saturn have only minor trace amounts of methane and quite a bit more hydrogen and ammonia.

This view of Uranus was recorded by Voyager 2 on Jan 25, 1986, as the spacecraft left the planet behind and set forth on the cruise to Neptune Even at this extreme angle, Uranus retains the pale blue-green color seen by ground-based astronomers and recorded by Voyager during its historic encounter. This color results from the presence of methane in Uranus’ atmosphere; the gas absorbs red wavelengths of light, leaving the predominant hue seen here. Image Credit: NASA/JPL

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Full Moon Merry Christmas

Tomorrow, just after six o’clock in the morning and just as the sun is rising, we’ll experience the first full moon to occur on Christmas Day since 1977.  I wasn’t even in high school yet in 1977 (although my husband was already in college by then).  If you miss opening this Christmas present, you won’t get another chance until 2034 (by which time I should be retired).

Other astronomical items of note this holiday week include:

  • On the 4th day of Christmas (Monday that is), Mercury reaches its peak distance from the sun 30 minutes after sunset in the southwest.
  • On the 5th day of Christmas (Tuesday), Saturn continues its return from behind the Sun.  Look to the southeast in the pre-dawn morning time.
  • On the 6th day of Christmas (Wednesday), look up and south to spy the Seven Sisters (aka as the Pleiades)
  • On the 8th day of Christmas (Happy New Year!), use binoculars to find Comet Catalina rising close to Arcturus (a very bright star) around midnight and continue to rise high in the southeast until dawn twilight.
  • On the 9th day of Christmas (Saturday, January 2, 2016) the Earth reaches its closest point to the Sun (at the start of Winter no less)
  • On the last day of Christmas (Twelfth Night) at 10 p.m. EST, Pluto hides behind the Sun.

Comet Catalina

For more interesting astronomical events and items, please visit Astronomy magazine’s The Sky This Week: December 25, 2015 – January 10, 2016 web page.

May the brightest star guide you in your search for Peace, Love and Joy.

Merry Christmas!

 

 

 

Look West After Sunset Tomorrow Evening

I probably won’t get to see this.  Snow is forecast for this afternoon in the KC metro area and continuing cloud cover for the next couple of days.  I’ll keep my fingers crossed and my eyes on the western horizon as I drive home tomorrow night.

For those of you with clear skies, enjoy a triple conjunction of the bright planet Venus, the red planet Mars and the two-old new Moon.

Whatever you do, just start watching the western twilight sky. Set a reminder on your phone if need be. The planets and moon won’t be up for long after sunset. And the views will be spectacular from now through Saturday night!

Earthsky, “Venus, Mars, moon after sunset February 19“