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DPChallenge Forums >> General Discussion >> The Ongoing Astronomy Thread.
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Showing posts 301 - 325 of 357, (reverse)
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07/01/2015 05:57:51 PM · #301
Originally posted by kirbic:

Originally posted by GeneralE:

I heard an astrophysicist the other day who remarked "There are a hundred billion stars in the galaxy, and a hundred billion galaxies in the known universe -- in fact, a hundred billion is the only number you need to remember in cosmology ... even the universe is a hundred billion years old -- in dog years."


I usually just wave my hand and refer vaguely to "Saganesque quantities" and that's close enough!

As I recall his catch-phrase was "billions and BILLIONS ..."

And then there are "Asimovian quantities" ... as he relates in Opus 100 one morning he said to his wife "If you were to examine all of North and South America to a depth of ten miles, do you know how many atoms of Astatine 215 you'd find? Why, practically none -- only a trillion."

Message edited by author 2015-07-01 18:01:33.
07/05/2015 11:53:23 PM · #302
ISS & Moon shot.

This guy is good at it.
07/06/2015 06:17:46 PM · #303
The Good, The Bad, And The Algae

¿"You can go back in once the water's degraded"?
07/15/2015 07:49:03 PM · #304
Dave Ross: Space: The Ultimate Sport

Originally posted by Linked Article:

NASA launched into space a probe shaped like a grand piano on a more than 9 year, 3 billion mile journey so that it could spend three minutes taking pictures of Pluto while traveling at a speed of 31,000 miles an hour.

That's 31,000 miles an hour! At that speed you could fly between New York and Honolulu in 9.5 minutes! Unfortunately with atmospheric friction you'd burn up somewhere over Chicago.

A 3 billion mile journey! If the Earth was a basketball sitting on a golf course, what NASA did was drive a molecule from the surface of that basketball to score a hole-in-one on a green 80 miles away. By the way, those are the actual rules for the next US Open.
07/21/2015 10:02:06 PM · #305
An EPIC view of Earth -- a recently-launched (but actually old and refurbished) satellite is now positioned at the L1 Lagrange point, and has sent back the first (non-composite) view of the entire sunlit side of the Earth since Apollo 17 (in 1972).
07/21/2015 11:37:12 PM · #306
Originally posted by GeneralE:

An EPIC view of Earth -- a recently-launched (but actually old and refurbished) satellite is now positioned at the L1 Lagrange point, and has sent back the first (non-composite) view of the entire sunlit side of the Earth since Apollo 17 (in 1972).


Suddenly I feel so small...
07/22/2015 09:06:32 PM · #307
What with the recent infusion of cash into the SETI project(s) some consideration has been given to what aliens would hear if they were listening for us -- the site Lightyear.fm will let you know ... for a most entertaining treatment of this aspect of the situation try to find Fredric Brown's story "The Waveries" from the August, 1945 edition of Astounding Science Fiction and anthologized by Groff Conklin in The Invaders ...
07/28/2015 09:18:12 PM · #308
Today's APOD belongs to our own strangeghost
07/28/2015 09:23:47 PM · #309
Originally posted by kirbic:

Today's APOD belongs to our own strangeghost

Very impressive two-for-one!
07/29/2015 03:43:36 PM · #310
July "Blue" Moon
Originally posted by Linked Article:

At this time of year, summer wildfires often produce smoke with an abundance of micron-sized particles–just the right size to turn the Moon truly blue.

On the other hand, maybe it will turn red. Often, when the Moon is hanging low, it looks red for the same reason that sunsets are red. The atmosphere is full of aerosols much smaller than the ones injected by volcanoes. These aerosols scatter blue light, while leaving the red behind.

For this reason, red Blue Moons are far more common than blue Blue Moons.

Sounds absurd? Yes, but that's what a Blue Moon is all about. Step outside at sunset on July 31st, look east, and see what color presents itself.
08/01/2015 08:03:06 PM · #311
Amateur Photographer Captures NASA-like Space Images
08/05/2015 03:13:37 PM · #312
Beautiful GIF animation of the moon crossing the face of the Earth... from a million miles away (four times further than the moon).
08/05/2015 09:26:05 PM · #313
Here's a page with more info and a still image in addition to the animation.
08/09/2015 01:03:39 PM · #314
How To Photograph A Silhouette In Front Of A Giant Moon
08/21/2015 09:46:10 AM · #315
Curiosity does a "mini-planet" selfie!
09/22/2015 11:19:56 PM · #316
Total Eclipse of the Harvest Moon -- 9/27/15!
10/06/2015 09:10:58 PM · #317
Shocking photos from NASA ...
10/22/2015 05:22:38 PM · #318
From today's NASA email:

NASA's Earth Observatory Group is proud to announce the release of

EONET: The Earth Observatory Natural Event Tracker
//eonet.sci.gsfc.nasa.gov/

More and more NASA imagery is being made available via web services (WMS, WMTS, etc.) and a significant percentage of it is being produced and published in near real time (within a few hours after acquisition). This ability means that NASA imagery can be used more routinely to examine current natural events as they happen.

The public can currently browse the entire globe using specialized client applications (e.g., NASA WorldView, Google Earth) to look for natural events as they occur. Storms are regularly spotted in the tropics, dust storms over deserts, forest fires in the summers. These events are occurring constantly and NASA imagery can represent them all using a variety of different data parameters. However, the user’s experience is guided, and therefore restricted, by the client application. What if there was an API that provided a curated collection of natural events and provided a way to link those events to event-related image layers? What if this API enabled developers to build their own client applications? Enter EONET.

EONET is a repository of metadata about natural events. EONET is accessible via web services. EONET will drive your natural event application.

For more information, please visit:
//eonet.sci.gsfc.nasa.gov/

API Documentation
//eonet.sci.gsfc.nasa.gov/docs/v2

Simple code how-tos
//eonet.sci.gsfc.nasa.gov/howto

Subscribe
//eonet.sci.gsfc.nasa.gov/subscribe

EONET has been developed with support from NASA’s Earth Science Data and Information System (ESDIS) Project.

Kevin Ward
NASA's Earth Observatory: "Where every day is Earth Day"
kevin.a.ward@nasa.gov
10/24/2015 03:20:26 PM · #319
In case you missed this in the original thread ...

Originally posted by Dr.Confuser:

Being a space geek, I looked at every NASA Apollo moon photo on Flickr and was completely blown away by these photos which are also available for download in original resolution. Being a photo geek, I picked a few of my favorites, downloaded them, and edited them to suit me.

These were all shot with film cameras ... digital photography hadn't been invented yet, or at least not commercialized, yet. Some were shot in B&W, many in color. (Although one of the astronauts commented that everything on the moon is gray. The only color there is was the color they brought with them.) The negatives were scanned to produce images of about 4,000 x 4000 pixels. Many were shot through space craft window glass. There's a lot of noise in some of them. But those artifacts aside, the Flikr photos are spectacular.

Click here to see my remastered edits.
10/26/2015 06:22:26 PM · #320
Champion Comet Hunter
Originally posted by Linked Article:

The Solar and Heliospheric Observatory, better known as “SOHO”, is a joint project of the European Space Agency, or ESA, and NASA. Orbiting the sun at 1.5 million km, or 932,000 miles from Earth, the distant observatory has just discovered its 3000th comet—more than any other spacecraft or astronomer. And, just about all of SOHO’s comets have been destroyed....

Prior to the launch of SOHO in 1995, only a dozen or so comets had ever even been discovered from space, while some 900 had been discovered from the ground since 1761. SOHO has turned the tables on these figures, making itself the greatest comet hunter of all time.

But SOHO hasn’t reached this lofty perch alone. The spacecraft relies on people who sift through its data. Anyone can help because SOHO’s images are freely available online in real time. Many volunteer amateur astronomers scan the data on a daily basis for signs of a new comet. The result: 95% of SOHO comets have been found by citizen scientists.
10/28/2015 03:09:17 PM · #321
Daily images of "Full Earth" now available
11/04/2015 10:10:33 PM · #322
Y'all probably still have a couple of days to see this close encounter of three planets in the pre-dawn sky ...

12/05/2015 11:40:17 AM · #323
Picture of Pluto from NASA released
12/06/2015 01:55:30 AM · #324
Comet Catalina is coming north now.

Sky & Telescope , Catalina
01/05/2016 08:06:03 AM · #325
it's been too cloudy or foggy here to see Comet Catalina.

There are some interesting planetary conjunctions coming up this week;

Nat'l Geo Conjunctions Jan 2016
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