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location Scandinavia
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visits member for 11 months
seen 8 hours ago

Android java developer newbie who tries to be as "agile" about it as I read be the current fashion.

I'm also interested in low level (c, assembler) programming of MCU IC's. Especially radio related (such as zigbee and low energy bluetooth).


2d
comment Do objects look larger the further away they are, beyond z=1?
@JohnDavis The particle horizon... I'm a rabbit in the moors.
2d
comment Do objects look larger the further away they are, beyond z=1?
Okay, now I understand nothing again. I suppose I'm sane after all.
Jan
27
comment Theoretical limits for natural satellites having natural satellites
Should be much easier in single lunar systems like Earth or Pluto, than in the well sorted Jupiter gravitational environment. The eccentricity of our Moon prevents any long-term stable orbits. But maybe Charon which is mutually tidally locked to Pluto could allow for it? And occasionally Earth captures an asteroid as a "minimoon". And many asteroids are binary, so...
Jan
27
comment What “revolutionary” discoveries were made by Hubble Telescope
The American Astronomical Society had a press conference about the 25 year history of the Hubble Space Telescope January this year. They use a very very bad media player, you have to click "Seminar for Science Writers: HST @ 25", you cannot download it, it loads very slowly and if you happen to click anywhere it will immediately reset. But the talks are very informative.
Jan
27
comment Layout of the universe
Make sure that more distant objects look larger than nearer objects, so it gets realistic and not "naive".
Jan
26
comment Do objects look larger the further away they are, beyond z=1?
Great illustration, thumbs up! I have no trouble understanding this logically. But... intuitively this is ridiculous!
Jan
26
comment Is there a cosmic, rather than technological, upper limit to what a telescope can resolve?
@FlorinAndrei And higher frequencies are more vulnerable to distortion than low frequencies, right? But the paper I saw talked about radio. Or is scattering discrete like something of the Lyman-Alpha Forest kind? There's much talk about the optical distortions through Earth's atmosphere, but maybe there's "a cosmic atmosphere" too through long distances.
Jan
25
accepted Do objects look larger the further away they are, beyond z=1?
Jan
25
comment Do objects look larger the further away they are, beyond z=1?
Aaargh! I've actually read that paper, but didn't realize this implication. The universe is so strange. I understand Chris Impey who in a public lecture series kind of mumbled to himself: "- I should just make up mad stuff to say in these lectures. I would get away with it."
Jan
25
asked Is there a cosmic, rather than technological, upper limit to what a telescope can resolve?
Jan
25
asked Do objects look larger the further away they are, beyond z=1?
Jan
24
comment How does radio bandwidth restrict the choice and use of science payload on interplanetary probes?
Is it really "simple" to use up the Deep Space Network? If you're doing a soil return anyway, like OsirisRex will, then why not throw a memory card into the return kit, and upgrade the sampling frequency of the instruments accordingly?
Jan
24
comment Why don't we orbit the center of our galaxy?
@DavidH Are you trying to make things difficult here ;-) So what is your answer?
Jan
24
answered Why don't we orbit the center of our galaxy?
Jan
21
comment How often does the supermassive black hole in the Milky Way become a quasar?
At least it was somehow active 2.5 to 4.0 million years ago according to this talk by Andrew Fox at the AAS2015, click "The Milky Way & Local Group", watch 15 minutes into it. And that event created the huge Fermi Bubbles. It indicates to me that it happens often and is harmless to us.
Jan
20
comment Why is the Moon receding from the Earth due to tides? Is this typical for other moons?
Is there a tidal wave in the Earth's molten mantle too?
Jan
18
comment How likely is it that the Sun will destroy our electric society?
@WayfaringStranger The "has been pretty minimal" sounds worrying to me. What will happen next? That forecast would give us another couple of years or a decade or some. Sounds like a marriage proposal. Maybe I should get myself a hard hat and a battery.
Jan
18
asked How likely is it that the Sun will destroy our electric society?
Jan
13
revised Why is liquid water considered a requirement for life?
edited body
Jan
13
answered Why is liquid water considered a requirement for life?