Instead, professional observatories use computers to capture data and images and send them to researchers around the world.
Nevertheless, visiting these observatories — like my previous visits to particle colliders — boggled my mind. After all, those who work at observatories operate time machines that can detect light emanating from the birth of our universe, billions of years in the past. Even with the naked eye, the light I saw from the nearby Large Magellanic Cloud was , years old. I said goodbye to Dr.
McLeod and his team and boarded a plane back to Santiago. As I stared out the window, looking down at the vast brown carpet of the Atacama below me, I considered my situation with strange clarity: I was a collection of bound-together atoms surrounded by other atoms hammered into the shape of a metal airplane tube.
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And this tube was propelling me through the sky by burning the remains of long-dead plants and animals. Weeks later, my wife and I traveled to Los Angeles and Hawaii to take in astronomy experiences aimed at the general public, the entry point for budding astronomers like the high school version of Dr.
In Los Angeles, I visited one of the most prominent observatories in the world — the Griffith Observatory, built in Like many other science facilities, access to the Griffith Observatory is free. It was a reminder that outside of the cost of getting there, science tourism is generally light on the wallet.
And if traveling far distances is an issue, many universities in the United States have observatories on campus that offer public viewing hours. We visited the jam-packed Griffith Observatory in the late afternoon. It was more than an hour until its inch Zeiss Refracting telescope would open for viewing the night sky, but already a line was forming of people wanting to get a closer look at the planets, the moon and the larger stars. I wondered whether the crowds at the Griffith Observatory were due mainly to its Hollywood celebrity. However, other astronomy sites were just as crowded.
We experienced this the following day, when we flew to the island of Hawaii to visit Mauna Kea, one of the world's top venues for astronomy. The Maunakea Visitor Information Station, located about two-thirds up the side of the dormant volcano, is base camp for the professional observatories on the summit. It is also a center for public astronomy in Hawaii.
Four evenings a week, a mix of employees and volunteers trundle out telescopes for everyone to see. People drive up hours before, because the parking lot almost always runs out of room well before the 7 p. Hundreds of us stood patiently in long lines, clutched cups of hot chocolate, waiting for glimpses of Jupiter and the North Star. Meanwhile, people hiked up a nearby hill to catch the last rays of the setting sun. It turned chilly. People donned sweaters and hotel bath towels to ward off the cold. In the winter, snow often covers the summit while vacationers enjoy the tropical climate at ocean level.
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The 14,foot-high summit at Mauna Kea holds 13 telescopes owned by a variety of countries and universities. Those with four-wheel drive vehicles can drive to the top and look around. We did this later in our trip. It was the middle of the day but it felt like evening. We drove through clouds, rain slicked the windshield and the temperature dropped from 80 degrees to Walking felt labored and the world took on an acute sharpness, as if rocks and boulders and the air itself had grown an edge.
We hiked to the high-altitude Lake Waiau, its brilliant blue water an intense contrast with the fiery sun. Nearby stood the observatories, all of them closed to visitors. Only the Keck Observatory has a small gallery on-site, but it had closed indefinitely several weeks before we arrived. A staffer back at the Information Station said the reason was vandalism. It would have been nice to enter one of the observatories, but after weeks of being immersed in astronomy, it was enough to stand on the mountaintop and gaze at the observatory domes jutting into the piercing blue sky.
At that moment, they seemed like a direct link to temples built on high places by our prehistoric ancestors, usually to be closer to the gods. We probably have always felt the urge to climb hills and mountains and stare at the sky. It was the beginning of June, a few days later. A warm, early summer evening.
Sirens rose in the distance. The air felt lethargic, unwilling to form a breeze. Streetlights glowed orange as I stepped onto my porch and looked around. I saw the usual city haze that obscures nearly all of the night sky. But the pull of a month of stargazing lingered on, and I looked up. Eventually I perceived the faint but unmistakable trace of the Big Dipper.
I kept looking, waiting for my eyes to become used to the dark. I thought about workers in astronomy observatories, getting ready for a night of exploration.
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More stars appeared. There was Jupiter like a beauty mark next to the moon. There was the North Star, twinkling just like in the lullaby. Standing in the middle of a city on our tiny planet, aware of my own fragile existence, I breathed a silent hello to the cosmos. Here are some additional observatories in the United States that are open to the public:. The Lowell Observatory in Flagstaff, Ariz. It was here, in , that Kansas-farmer-turned-observatory employee Clyde Tombaugh discovered Pluto. Daytime and nighttime tours take place every day of the week, as well as viewing of the night sky through the inch Clark Refractor Telescope, weather permitting.
Farther south, near Tucson, the Kitt Peak National Observatory offers daytime and nighttime activities, including night sky viewing from telescopes located in their visitor center. In operation since , the Lick Observatory is owned and operated by the University of California system. Admission is free to the complex, as well as to the visitor center and gift shop. One highlight is the Summer Series, which are evening events that include night sky viewing through the inch Great Refractor and the inch Nickel Reflector telescopes. There's no common abbreviation for magnitude per square arcsecond, but for conveniene, I will write it as mpss in this article.
An SQM reading of magnitude Let's put that another way. When you look at the Milky Way through a telescope, you see countless individual stars, but to your unaided eye most of those stars blend into a diffuse glow. A sky that glows at Actually, that's not really true, because artificial light is generally much redder than starlight. But we'll ignore color for the remainder of this article. As with regular astronomical magnitudes, the bigger an SQM reading, the darker the sky is.
See our article on Stellar Magnitudes if you're unfamiliar with this concept. To give a sense of what mpss means in practice, here are some typical skyglow readings at the zenith directly overhead in various different situations. These are mostly based on my own measurements with an SQM and digital cameras. Coments about the Milky Way apply to mid-northern latitudes. The Moon itself is blocked by a shade to keep it from burning out the photo.
See my blog How Brightly Shines the Moon? Tony Flanders Skyglow from artificial sources is distributed very unevenly across the sky. The zenith is relatively dark, because when you look straight up, there's less light-scattering air between you and outer space. Artificial skyglow also tends to be quite asymmetric. In a typical suburban setting, it's much stronger when you're facing toward the central city.
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Individual sources such as shopping centers, automobile dealers, and lighted ballparks create distinct light domes that can stretch surprisingly high into the sky. At a site in the Northern Hemisphere, the glow toward the south is particularly important. Because skyglow is so much weaker toward the zenith, it's always a good idea to observe faint objects when they're as high as possible in the sky. This also minimizes atmospheric absorption and distortion.