Return Flight from the Moon

Return Flight from the Moon

On July 20, 1969, the Apollo 11 reached the Moon. Millions watched as Neil Armstrong and Buzz Aldrin took their first steps on the surface. The United States had reached the Moon before the Soviet Union, and the first part of President Kennedy’s objective to the nation, of “landing a man on the moon and …

Voyager Artist Rendering

Time Capsule in the Stars: Exploring Voyager 1’s Golden Record

In September 2013, NASA announced that the Voyager 1 probe had successfully entered interstellar space; the first human-made object to do so. As the probe continues forth into the vast unknown, it carries with it a special collection of “welcome signs” for any life forms it may encounter. Known as the Voyager Golden Record, this …

Milky Way Galaxy Star Crystal

Carving the Milky Way: How Bathsheba Grossman Mixes Science and Art in Laser Etching Designs

One’s first encounter with the Milky Way Galaxy Star Crystal may leave almost as much wonder as seeing NASA’s images of the galaxy itself; a bright, swirling mass of tiny bright dots hovering in a vacuum, or in this case a block of solid crystal. California artist Bathsheba Grossman has made a career for herself …


Twilight Lunar & Planetary Parade

Mark the three evenings of September 7th, 8th and 9th on your calendar to watch a fascinating interplay of the crescent Moon and two bright planets in the southwestern sky after sunset. And later in the month, another planet joins the parade. All of this will provide yet another example of the fact that the …


The Sky’s Finest Galaxy!

The word "galaxy" is entrenched in the popular mind—everyone’s heard of these remote star cities, but with the exception of stargazers few have ever seen one. Or so they think. One of them has been readily visible to anyone who’s ever looked up at the summer sky on a dark clear night. It’s none other …


Observing Sunspots

If you’ve ever wanted to see sunspots, now’s the time! Our "Daytime Star" is at its long anticipated sunspot maximum this year, with its visible surface peppered much of the time with dark spots of various sizes. Watching them develop and move across the face of the Sun from day-to-day as it slowly rotates is …


Star-Testing Your Telescope

Many sophisticated methods of evaluating the optical quality of a telescope have been developed over the years. But there’s one very simple, convenient, and sensitive test that’s easy to perform any clear night. Known as the extrafocal image test, it uses an actual star as the test source.


Three Plus One = Four Planets At Dusk!

A dramatic trio of planets play tag with each other after sunset low in the west-northwestern sky during the last week of this month–along with a lone lovely planet in the southeastern one all month long. Here’s an opportunity to see the two innermost and fastest-moving planets bunched together with the largest of all such …


Monster Telescopes!

For decades after its dedication in 1948, the famed 200-inch Hale reflecting telescope at Palomar inCaliforniareigned supreme as the world’s largest telescope. (Russiahad built a somewhat bigger one but it never performed as hoped.)  Then came the twin 400-inch scopes at the Keck Observatory inHawaii, twice as big as Hale. But now, two instruments are …


Comet PanSTARRS Alert!

Skimming along the western horizon some 30 to 45 minutes after sunset in March, a bright new comet will be making its appearance in our evening sky.  Predicted to be easily visible even to the unaided eye—and sprouting a noticeable tale pointing northward— it promises to be quite a spectacular sight in binoculars and wide-field …