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IAU Statement on Satellite Constellations | IAU

June 6th, 2019 1 comment
Categories: Astronomy, Elon Musk, Space, Uh-oh Tags:

Trails made by Starlink satellites | IAU

June 6th, 2019 No comments

Source: Trails made by Starlink satellites | IAU

60 up, 1140 to go.

One point: the link suggests these satellites will fade; a week after launch they were mag. 3 to 6, and seemed to me to be heading dimmer (magnitudes work in reverse, like wire gauge, well, AWG at least… ).  So they could be out of naked eye view (>~mag 6) if they go much higher.

But if they’re doing 12000 total over 10 years, 200 launches, 20 a year.  So ~2 times a month there will be a multi-week interuuption in dark sky astronomy.

Another point: these sateliites, as with all that aren’t generating their own light (which is all current satellites), are visible by the reflected light from the just-set sun.  Once the sun sets far enough, sunlight doesn’t reach these satellites.  Think of being on the satellite, 300km high orbit, the sun sets when *you* can’t see it anymore.  And for satellites in such a low orbit, this is not very long, perhaps 1 hour after sunset.

Categories: Astronomy, Elon Musk, Space, Uh-oh Tags:

9 Subtle Ways Psychopaths Communicate Differently, According to Science | Inc.com

June 5th, 2019 No comments

Source: 9 Subtle Ways Psychopaths Communicate Differently, According to Science | Inc.com

Hmmm… I wonder if I’m a pyscopath?  But there’s no point in self-evaluating.  Same nonsense as self-evaluated personality tests (I’m looking a you, Ms. Kolbe…)

Categories: Fantasy, it works bitches!, Skeptical Tags:

The Perpetual Diamond: Contrast Reversals Along Thin Edges Create the Appearance of Motion in Objects – Oliver J. Flynn, Arthur G. Shapiro, 2018

June 4th, 2019 No comments
Categories: Neurology Tags:

Traces of Extraterrestrial Organic Matter Have Been Found in South Africa’s Mountains

June 1st, 2019 No comments
Categories: Science Tags:

The astronomical magnitude scale

May 29th, 2019 No comments

Primary and secondary information on comets and observing comets.

Source: The astronomical magnitude scale

Categories: Astronomy, Info, Space Tags:

My Theory on Time Travel

May 24th, 2019 No comments

there is a force that prevents “impossible” things

can’t be a time machine invented in the future; if there was, we would have a history with no major catastrophes.  TTs would have gone back to prevent, or otherwise alter, horrific events (kill Hitler, prevent the Arch-Duke Whats-his-name assasintation = no WW1, etc.); this idea is probably not new…

might be related to how… ???

Categories: Funny, My Work, Science Tags:

Huge Asteroid Apophis Flies By Earth on Friday the 13th in 2029. A Lucky Day for Scientists | Space

May 6th, 2019 No comments
Categories: Astronomy, Uh-oh Tags:

New discovery makes fast-charging, better performing lithium-ion batteries possible

April 27th, 2019 No comments
Categories: energy, Science Tags:

Scientists Take a Step Toward Decoding Speech from the Brain – Scientific American

April 26th, 2019 No comments
Categories: Neurology Tags: