Search found 2479 matches
- Sun Sep 06, 2020 11:50 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: M1: The Crab Nebula from Hubble (2020 Sep 06)
- Replies: 13
- Views: 3580
Re: APOD: M1: The Crab Nebula from Hubble (2020 Sep 06)
The explanation's link to 1054 AD's first paragraph says this: On July 4, 1054 A.D., Chinese astronomers noted a "guest star" in the constellation Taurus; Simon Mitton lists 5 independent preserved Far-East records of this event (one of 75 authentic guest stars - novae and supernovae, excl...
- Sat Sep 05, 2020 1:18 pm
- Forum: Open Space: Discuss Anything
- Topic: Hobbies
- Replies: 30
- Views: 22617
Re: Hobbies
I thought; dang, I don't have any! Then I thought; oh, I spend about half a day on the computer; sports, games, DVDs, APOD! Then I have my garden, and we walk the dog! Oh the dog is a hobby in her own right; she is kind of a lazy thing, so I like to mess with her a little! I taught her how to wink,...
- Fri Sep 04, 2020 9:22 pm
- Forum: The Communications Center: Breaking Science News
- Topic: astrobites: Daily Paper Summaries 2020
- Replies: 202
- Views: 65612
Re: Parker’s Solar Wind
Parker’s Solar Wind astrobites | Daily Paper Summaries | 2020 Sep 03 Nearly 70 years ago, Eugene Parker , a young professor at the University of Chicago, discovered something that would change out understanding of all stars, including our own Sun. The solar wind is a continuous stream of particles ...
- Fri Sep 04, 2020 7:08 pm
- Forum: The Communications Center: Breaking Science News
- Topic: AAS NOVA — Research Highlights 2020
- Replies: 113
- Views: 38568
Re: LIGO/Virgo’s Newest Merger Defies Mass Expectations
Was this GW event also detected by other em radiation telescopes? Follow the links :wink: https://asterisk.apod.com/viewtopic.php?t=40963 https://asterisk.apod.com/viewtopic.php?t=40714 Black Hole Collision May Have Exploded with Light California Institute of Technology | 2020 Jun 25 Possible Flare...
- Fri Sep 04, 2020 6:40 pm
- Forum: Open Space: Discuss Anything
- Topic: Hobbies
- Replies: 30
- Views: 22617
Hobbies
Has there previously been a thread here on members' hobbies? If so I haven't found it, so this post can start one or perhaps be appended to an earlier one if it exists. I have two. Astronomy of course, or I wouldn't be a member of Starship Asterisk*. But astronomy is such a vast field that a persons...
- Fri Sep 04, 2020 5:30 pm
- Forum: The Communications Center: Breaking Science News
- Topic: AAS NOVA — Research Highlights 2020
- Replies: 113
- Views: 38568
Re: LIGO/Virgo’s Newest Merger Defies Mass Expectations
LIGO/Virgo’s Newest Merger Defies Mass Expectations NOVA | American Astronomical Society | 2020 Sep 02 Been waiting for new signals to be parsed from LIGO/Virgo’s third observing run data? Wait no longer! The latest detection announced in Physical Review Letters and ApJ Letters is big news — both f...
- Fri Sep 04, 2020 1:30 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Wizard Nebula (2020 Sep 04)
- Replies: 9
- Views: 3270
Re: APOD: The Wizard Nebula (2020 Sep 04)
Let's see. Here we have a mapped color image of a nebula that is 8,000 light-years distant but still large enough in the sky to cover the full Moon. Sounds big. This thing must have a powerful stellar engine driving it. What is said about the stellar engine? APOD Robot wrote: Open star cluster NGC ...
- Thu Sep 03, 2020 1:23 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: A Halo for Andromeda (2020 Sep 03)
- Replies: 21
- Views: 7524
Re: APOD: A Halo for Andromeda (2020 Sep 03)
Not that I doubt DMs really, but it’s easy to ignore or forget something that’s invisible and that has so far defied all attempts to physically explain. MOND might be ill, but it ain’t dead yet.heehaw wrote: ↑Thu Sep 03, 2020 8:51 am I notice, not one word about the dark matter (which is MOST of the matter)!
- Wed Sep 02, 2020 7:21 pm
- Forum: The Communications Center: Breaking Science News
- Topic: LIGO: "Bang" Signals Most Massive Gravitational-Wave Source Yet
- Replies: 3
- Views: 1876
Re: LIGO: "Bang" Signals Most Massive Gravitational-Wave Source Yet
From the Northwestern U. report above by bystander, fourth citation below quotation: An international research collaboration including Northwestern University astronomers has witnessed the birth of an “intermediate-mass” black hole. This is the first conclusive discovery of an intermediate-mass blac...
- Wed Sep 02, 2020 6:01 pm
- Forum: The Communications Center: Breaking Science News
- Topic: DESY: Cosmic Cloud's Gamma-Ray Heartbeat Puzzles Scientists
- Replies: 8
- Views: 2567
Re: DESY: Cosmic Cloud's Gamma-Ray Heartbeat Puzzles Scientists
I fear this is a dumb question, but I'd rather look dumb by asking than to stay dumb by not asking, so ... This hypothesis lacks direct empirical evidence but has generally been accepted from indirect evidence. What exactly is the difference between 'direct empirical evidence' and 'indirect evidence...
- Tue Sep 01, 2020 4:25 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Salt Water Remnants on Ceres (2020 Sep 01)
- Replies: 15
- Views: 5713
Re: APOD: Salt Water Remnants on Ceres (2020 Sep 01)
This mineral deposit dome on Ceres reminds me of something similar here on Earth: The immense mound of mineral deposits at Mammoth hot springs in Yellowstone National Park, USA. On Ceres the cause was the impact that created Occator crater. At Mammoth the cause is the hot spot deep in the Earth caus...
- Mon Aug 31, 2020 2:45 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Shell Galaxies in Pisces (2020 Aug 27)
- Replies: 39
- Views: 12364
Re: APOD: Shell Galaxies in Pisces (2020 Aug 27)
Neil deGrasse Tyson recommends that we "question everything ", so when The gravitational influence of a supermassive black hole is not very significant once you are just a few light years away from it. it makes me wonder. The relative unimportance of supermassive black holes is an opinion...
- Mon Aug 31, 2020 2:11 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: SS 433: Binary Star Micro-Quasar (2020 Aug 31)
- Replies: 21
- Views: 11509
Re: APOD: SS 433: Binary Star Micro-Quasar (2020 Aug 31)
This system fits the old adage 'truth is stranger than fiction.'
- Mon Aug 31, 2020 3:03 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 6357: Cathedral to Massive Stars (2020 Aug 30)
- Replies: 14
- Views: 8682
Re: APOD: NGC 6357: Cathedral to Massive Stars (2020 Aug 30)
ps that's me trying to say "go easy on whoever made this image they did the best they could with what they had" Roger on that geck. After looking at several of the links in the explanation I noticed that this very same image is featured on NASA webpages. (hey Orin, if you really like it y...
- Sun Aug 30, 2020 8:51 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Shell Galaxies in Pisces (2020 Aug 27)
- Replies: 39
- Views: 12364
Re: APOD: Shell Galaxies in Pisces (2020 Aug 27)
Neil deGrasse Tyson recommends that we "question everything ", so when The gravitational influence of a supermassive black hole is not very significant once you are just a few light years away from it. it makes me wonder. The relative unimportance of supermassive black holes is an opinion ...
- Sun Aug 30, 2020 1:59 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: NGC 6357: Cathedral to Massive Stars (2020 Aug 30)
- Replies: 14
- Views: 8682
Re: APOD: NGC 6357: Cathedral to Massive Stars (2020 Aug 30)
Today's APOD is a fascianting portrait of one of the most remarkable sites of high-mass star formation in our galaxy. Can't stand the colors, though. There is no way that the star near the bottom of the image, which is deeper embedded in nebulosity that the cluster "above" it, should look...
- Sun Aug 30, 2020 1:14 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Shell Galaxies in Pisces (2020 Aug 27)
- Replies: 39
- Views: 12364
- Fri Aug 28, 2020 4:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Valley of Orion (2020 Aug 28)
- Replies: 10
- Views: 3283
Re: APOD: The Valley of Orion (2020 Aug 28)
The importance of the Trapezium was highlighted by this sentence in the explanation: Orion's valley ends in a cavity carved by the energetic winds and radiation of the massive central stars of the Trapezium star cluster . The link in that quote leads to an APOD from three years ago, called "At ...
- Fri Aug 28, 2020 3:33 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: The Valley of Orion (2020 Aug 28)
- Replies: 10
- Views: 3283
Re: APOD: The Valley of Orion (2020 Aug 28)
Yes this is a nice video. I don't want to come off sounding like a hater here, but there are a few issues that keep me from liking it completely. I like the zoom in beginning, but then there seem to be a bit too many hard and flat boundaries between cloud and empty space. Straight edges to clouds ap...
- Thu Aug 27, 2020 10:57 pm
- Forum: The Communications Center: Breaking Science News
- Topic: NASA/STScI: Hubble Maps Giant Halo Around Andromeda Galaxy
- Replies: 1
- Views: 1324
Re: NASA/STScI: Hubble Maps Giant Halo Around Andromeda Galaxy
Hang on y'all. The "collision" has already begun.This means that Andromeda’s halo is already bumping into the halo of our own galaxy.
- Thu Aug 27, 2020 6:10 pm
- Forum: Open Space: Discuss Anything
- Topic: Weather!
- Replies: 2855
- Views: 992026
Re: Weather!
The 2020 Atlantic Hurricane season doesn't even peak until September 10th, and Texas has already been affected by two. Granted, Texas has a long coastline, but there have been years when the entire US coastline wasn't hit by a single hurricane. Well, that used to happen occasionally. Don't bet on it...
- Thu Aug 27, 2020 4:22 pm
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Visualization: A Black Hole Disk... (2020 Aug 25)
- Replies: 27
- Views: 8410
Re: APOD: Visualization: A Black Hole Disk... (2020 Aug 25)
Thanks neufer, and especially for your always very well-formatted posts, even if sometimes I have to try real hard to follow your occasionally non-sequitur train of thought :) It is my primary goal to drag *Asternauts into my large Egosphere and set their head a spinning. The truth is revealed :!:
- Thu Aug 27, 2020 3:39 pm
- Forum: The Communications Center: Breaking Science News
- Topic: astrobites: Daily Paper Summaries 2020
- Replies: 202
- Views: 65612
Re: Limiting Early Dark Energy with Large-scale Structure
H0w Low Can You Go? Limiting Early Dark Energy with Large-scale Structure astrobites | Daily Paper Summaries | 2020 Aug 21 The Hubble constant (H0) has quickly become a star in the world of forced astronomical acronyms (H0LiCOW, SH0ES), and for good reason. Measuring H0 quantifies the expansion of ...
- Wed Aug 26, 2020 4:08 am
- Forum: The Bridge: Discuss an Astronomy Picture of the Day
- Topic: APOD: Visualization: A Black Hole Disk... (2020 Aug 25)
- Replies: 27
- Views: 8410
Re: APOD: Visualization: A Black Hole Disk... (2020 Aug 25)
Relativistic jets may provide evidence for the reality of frame-dragging. Gravitomagnetic forces produced by the Lense–Thirring effect (frame dragging) within the ergosphere of rotating black holes combined with the energy extraction mechanism by Penrose have been used to explain the observed prope...
- Tue Aug 25, 2020 8:41 pm
- Forum: The Asterisk Café: Discuss Anything Astronomy Related
- Topic: Look At This!
- Replies: 4
- Views: 2225
Re: Look At This!
The face of a sea lion. Beautiful, unless you're a small fish.