You may know the Greek myth of Perseus, a young hero who slew the petrifying Medusa and the sea monster Cetus, in order to rescue the beautiful Andromeda from her cruel mother Cassiopeia. The ancient Greeks saw fit to immortalize the story in the sky, by tracing constellations resembling these characters. We recognize these constellations today-- in particular, Andromeda with its legendary naked-eye galaxy M31, our closest spiral galactic neighbor.
The winter evening sky was dominated by two exceptionally bright “stars” that are actually planets — resplendent Venus, nearest of planetary neighbors, in the west, and regal Jupiter, largest of the planets, in the east. As we enter spring, Venus and Jupiter remain celestial highlights, and will treat us to a special double-feature in mid-April — each planet will be very close to a prominent open star cluster.
If you rise early on Saturday, April 4 you will be treated to an unusual event: the third of four total lunar eclipses occurring within a period of just two years. This has been called a lunar eclipse tetrad.
Originally published on Tue March 31, 2015 6:07 pm
Saturn's moon Enceladus is a mystery. From Earth it looks tiny and cold, and yet it's not a dead hunk of rock. Passing spacecraft see trenches and ridges, similar to Earth's, and in 2005 NASA's Cassini mission spotted ice geysers streaming from its south pole.
Venus, Mars, and a thin crescent Moon will create a stunning sight in our early evening sky on February 20. If skies are clear, find an open spot with an unobstructed horizon and look to the west between 6:15 and 7:00 p.m. At first you may see brilliant Venus next to a thin, crescent Moon. As twilight fades, fainter Mars will appear between Venus and the Moon. Use binoculars for a truly amazing view!
At first glance, our night skies can appear as a dark canvas illuminated with points of mono-hued light. But, as your eyes adapt, and on closer inspection, one can pick out stars with colors that are blue, white, gold, and reddish orange.
The Moon is very bright during the first week of January, and it’s tempting to go for a snow shoe trek or ski tour by moonlight. But two weeks ago, the moon was hardly visible at all. There is one main factor that determines the visibility and brightness of the moon: lunar phase. But, varying Earth-Moon distance also plays a role.
The December solstice is coming! At 4:03 p.m. Mountain Standard Time on December 21st, the Sun reaches its most distant point south in 2014, as viewed from Earth. This defines the December solstice, which is the shortest day in the Northern Hemisphere and the longest day in the Southern Hemisphere.
With fewer hours of sunlight during autumn the nights grow longer and there is a distinct chill in the air after the sun sets. You may notice the sky appears darker and the stars just a little clearer. A star chart or an astronomy app for a phone or tablet will guide you to the fall constellations and many of the stars visible in our skies.
On these late October evenings, you may see a hazy band of light stretching from the southwestern horizon and crossing overhead to the northeast. This is the Milky Way, an object of great wonder throughout human existence.