Enjoying EarthSky? Subscribe.

116,648 subscribers and counting ...


Posts by Larry Sessions

The sun in extreme ultraviolet, false color green
Blogs | Sep 18, 2014

Top 10 things you might not know about stars

Here’s a collection of 10 unexpected, intriguing facts about the stars of our universe – including our sun – that you probably didn’t know!

09sep14_430
Tonight | Sep 14, 2014

Use Big Dipper to find Polaris, the North Star

You can find the North Star, Polaris, using the two outermost stars in the bowl of the Big Dipper.

Aurora borealis by FairbanksMike
Science Wire | Sep 12, 2014

Significant auroras predicted for tonight

Reports from NOAA and elsewhere predict a chance of significant auroras, possibly observable as far south as the northern U.S. and maybe even farther south.

South to overhead late summer to autumn
Tonight | Aug 28, 2014

61 Cygni is the Flying Star

61 Cygni isn’t bright. But it moves exceptionally rapidly against the background of more distant stars. Its motion reveals its nearness to Earth.

M8  via ESO/S. Guisard/S. Brunier
Tonight | Aug 26, 2014

Messier 8 is the Lagoon Nebula

The Lagoon Nebula aka M8 is the largest and brightest of a number of nebulosities in and around Sagittarius.

Vega via NASA Jet Propulsion Laboratory
Tonight | Jul 24, 2014

Vega is the Harp Star

One of the prettiest stories in all skylore surrounds this star. “On the 7th night of the 7th moon … “

2014-july-20-aldebaran-pleiades-moon-night-sky-chart
Tonight | Jul 20, 2014

Moon, star cluster, bright star beautiful before dawn July 21

A beautiful view of the waning crescent moon, Pleiades star cluster and bright star Aldebaran In dark eastern skies before dawn on July 21.

Supermoon-cp
Jul 11, 2014

Does a supermoon have a super effect on us?

The moon (and sun) creates the tides. An extra-close full moon creates higher tides. But this same gravitational effect doesn’t extend to humans.

Antares and M4 image by stargazerbob@aol.com
Tonight | Jul 01, 2014

Antares is Heart of the Scorpion

The ruby Heart of Scorpius is the 16th brightest star in our sky and one of the most gigantic stars known.

clock_almost_midnight
Blogs | Jun 30, 2014

No leap second to added on June 30

World timekeepers will not add a leap second on June 30, 2014. Meanwhile, a proposal to dump the leap second has been deferred until 2015.