Skytalk A weekly discussion of what's new and interesting in astronomy with astronomer Derrick Pitts



A weekly discussion of what's new and interesting in astronomy with astronomer Derrick PittsMore from Skytalk »

Most Recent Episodes

Diminished Daylight in the Dog Days

We've now lost 25 minutes off sunsets and 30 minutes off sunrises - that's an hour daylight change already from the solstice.

Total Tune-Up

Monday's lunar eclipse is the precursor to the August 21 total solar eclipse that will traverse the United States. Saturday is the peak of the Perseid Meteor Shower.

Follow the Sun

We are now just three weeks out from a total solar eclipse traversing the United States.

Shine on, you crazy Earth

This is a great week to watch the development of lunar phases. Start watching on Monday night, with a barely visible 1.5-day old thin crescent that sets about an hour after the sun; you should see it near the western horizon at 8:30 P.M. On Monday and Tuesday night, you'll have a great display of "Earthshine."

Shining Star (but just barely)

The smallest star ever just found, called ELBM-J0555-57Ab, is just about the size of Saturn but 300 times as massive. That makes it just 8% of the sun's mass, yet it's just big enough to actually BE a star according to thermonuclear fusion principles

It was 20 years ago today...

On this date in July 1997, NASA placed the first rover on Mars.

You Must Remember This – An Eclipse Is Not Just an Eclipse

The August 21st Solar Eclipse is less than 2 months away.

Twice Upon a Time...

Sun's Original Twin: What happened to it?

Some Like it Hot

If you're sweating from our current heat wave, be glad you don't live on planet KELT-9, orbiting a blue A-type star 620 light years from Earth.


You don't have to trek out to Wiltshire, England to celebrate the summer solstice at Stonehenge. Philadelphia is a suitable site to take in an equinox spectacle.

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