Using 19th century technology to time travel to the stars

March 26, 2015 by Nancy Atkinson, Universe Today
This image of a spiral galaxy, taken on a glass photographic plate, is one in a series of photos taken over decades. From the Harvard Plate collection. Credit: American Museum of Natural History

In the late 19th century, astronomers developed the technique of capturing telescopic images of stars and galaxies on glass photographic plates. This allowed them to study the night sky in detail. Over 500,000 glass plate images taken from 1885 to 1992 are part of the Plate Stacks Collection of the Harvard-Smithsonian Center for Astrophysics (CfA), and is is the largest of its kind in the world.

"The images captured on these plates remain incredibly valuable to science, representing a century of data on that can never be replaced," writes astronomer Michael Shara, who is Curator in the Department of Astrophysics at the American Museum of Natural History in New York City, who discussed the plates and their significance in a new episode of AMNH's video series, "Shelf Life."

These plates provide a chance to travel back in time, to see how stars and galaxies appeared over the past 130 years, allowing astronomers to do what's called "time domain astronomy": studying the changes and variability of objects over time. These include stars, , and jets from stars or galactic nuclei.

But viewing these plates is difficult. The glass plates can still be viewed on a rather archaic plate viewer—a device that's like an X-ray light box in a doctor's office. But those aren't readily available, and Harvard is hesitant about shipping the 100-plus-year-old glass plates around the world. If astronomers travel to Cambridge to dig through the archives, they can spend hours poring over logbooks or just looking for the right plate. Plus, there's not an easy way to compare these plates to today's digital imagery.

AMNH is helping CfA to digitize the glass plates, which is discussed in the video. There's also a called DASCH to help digitize the telescope logbooks record that hold vital information associated with a 100-year-long effort to record images of the sky. By transcribing logbook text to put those historical observations in context, volunteers can help to unlock hidden discoveries.

Explore further: Volunteers needed to preserve astronomical history and promote discovery

More information:dasch.rc.fas.harvard.edu/
www.cfa.harvard.edu/news/2014-23

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SciTechdude
5 / 5 (3) Mar 26, 2015
I immediately wanted a framed copy of that photo. That's one of the most artistically striking visions of space I've ever seen. Can you imagine a mini-home gallery with 3 or 4 such photos? Amazing.
AmritSorli
not rated yet Mar 31, 2015
time travel are out of question.......onecan travel in space only and time is duration of its motion www.fopi.info
Whydening Gyre
not rated yet Mar 31, 2015
time travel are out of question.......onecan travel in space only and time is duration of its motion http://www.fopi.info

How did you NOT get that "time travel" (in regards to this article) was merely a figurative literary instrument?

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