First Friday Astronomy

The Large Magellanic Cloud, a satellite galaxy of the Milky Way. From Wikipedia.

On a clear night in central Idaho, you can see the sweep of our own Milky Way galaxy split the velvet sky. Although we now know the observable Universe spans 13 billion light years, in the 1920s, astronomers didn’t even know how big the Milky Way was. In fact, many astronomers believed our galaxy comprised the entire universe and that what we now know as different galaxies were just strange nebulae within the Milky Way. The story of how astronomers finally took the true measure of the Universe as a result of the the tireless efforts of a human computer.

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Night sky within the Central Idaho Dark Sky Reserve. Taken from https://www.ioes.ucla.edu/project/tracking-light-pollution-in-the-central-idaho-dark-sky-reserve/.

The dramatic growth of the Treasure Valley impacts more than just commute times. The glare from our shining cities also obscures the night sky. And, like other forms of pollution, light pollution respects no municipal boundaries. Treasure Valley’s bright lights and big cities are starting to affect the night skies in the nearby Central Idaho Dark Reserve (CIDSR). Here are some of the details of our local light pollution and ways we can help mitigate its effects.

Much of the information here comes from this report written by the students from the UCLA Institute of the Environment and Sustainability.

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The Zodiacal light, a feature that requires unusually dark skies.

(This post previously ran in 2021 May but has been updated.)

Summer is the prime stargazing season. Venture out under the crystal Moon to watch Scorpius chase Orion from the sky. But if you stay within Boise’s city limits, you may find it harder to see some of your favorites. As Boise grows, so too does its footprint in the sky. However, there are many places in Idaho largely unmarred by the glare of municipal growth.

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In 1986, superstars Lionel Richie and Michael Jackson won a Grammy for “Best Song of the Year” for “We are the World“, a single recorded to support the African charity USA for Africa (https://usaforafrica.org/) to provide food and relief aid to starving people in Africa, specifically Ethiopia where a famine raged. With sales in excess of 20 million copies, it is the eighth-bestselling physical single of all time, and it immediately generated 60 million dollars.

But 1986 also marked the 300th anniversary of one of the most popular science books of all time, Conversations on the Plurality of Worlds. And a NASA mission just over the horizon may turn the sci-fi conversations about alien life from this classic pop-sci book into science fact.

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JWST observations compared to Hubble’s.

Like the musical “Hamilton”, the James Webb Space Telescope lives up to the hype. Already, astronomers have used it to discover galaxies older and more distant than ever before, and it’s only getting started. One of the astronomical processes JWST will elucidate is the formation of stars. Understanding star formation is critical if we want to answer questions about the origin of life on Earth and the possibility for life elsewhere in the universe. But even though scientists have been thinking about star formation since before the word “scientist” existed, some of the most basic questions about the process remain unanswered.

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Gravitational lensing of distant galaxies observed by Hubble. From https://www.nasa.gov/content/discoveries-highlights-shining-a-light-on-dark-matter.

Although our current understanding of gravity, the theory of general relativity, arose only one hundred years ago, scientists were speculating about exotic gravitational effects going back to before the word “scientist” even existed. Today, astronomers employ gravity in a variety of ways to study the cosmos, to look for planets outside our solar system and even to weigh some of the largest celestial bodies in existence. These measurements have shed light on some of the darkest of astronomical mysteries.

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First Friday Astronomy/So You Got a Telescope? Event – 2022 June 3

Did you get a new telescope, find an old telescope, just need help to learning how to use your telescope? Join Boise Astronomical Society for a hands-on telescope tutorial. Tutorial starts 5p MT at Boise State: maps.boisestate.edu/?id=715#!m/89075.

followed by

Weighing and Measuring the Universe with Galaxy Clusters – Dr. Andres Salcedo, U of Arizona

Lecture starts 7:30p MT

Attend virtually: boi.st/astrobroncoslive or In-person attendance on Boise State’s campus: maps.boisestate.edu/?id=715#!m/89069

Watch Dr. Salcedo’s talk!