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by midtskogen
18 Jul 2018 03:12
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 66
Views: 2384

Solar System dynamics discussion thread

Can we have a Lagrange point in "orbit" closer than 3 times the horizon radius, and a mass stuck at that point?
by midtskogen
17 Jul 2018 09:15
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 66
Views: 2384

Solar System dynamics discussion thread

I suspected that (but I didn't know that there is a 3 times radius limit, which seems less obvious).  Then, I also suspect that it may also be difficult to form Lagrange points outside the horizon which not even light can reach, even given the freedom to pick whatever configuration.  But intuition b...
by midtskogen
16 Jul 2018 13:31
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 66
Views: 2384

Solar System dynamics discussion thread

A related question, what can we say about Lagrange points within the Swartzchild radius - would they create time loops in which things actually could get stuck, avoiding the singularity?  But the sources of the points are destined for the singularity.  I can't wrap my mind around this.
by midtskogen
16 Jul 2018 13:20
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 430

What exoplanet might reply us back?

I wouldn't even call it indirect evidence, but rather a prerequisite for life as we know it.  To claim that it's evidence for life, would be  affirming the consequent . It's a very long way from these organic molecules to unicellular life.  The presence of limestone in Italy is not indirect evidence...
by midtskogen
15 Jul 2018 10:31
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 430

What exoplanet might reply us back?

Um, no. Perhaps what you think of is the news that Curiosity found molecules that are building blocks for life.
by midtskogen
15 Jul 2018 03:17
Forum: Science and Astronomy Discussions
Topic: Solar System dynamics discussion thread
Replies: 66
Views: 2384

Solar System dynamics discussion thread

Wow.  I need to read this again when I have more time.  A question: If the bodies are really massive (merged?) black holes, could the slopes down from L4 and L5 be so steep so these points become a kind of massless "white" hole?  
by midtskogen
14 Jul 2018 23:29
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 430

What exoplanet might reply us back?

Yes, Mars is getting the attention, and given that detection on Mars so far has failed, it seems to me that Veneran life is more likely than Martian life, both having fairly low odds, though.
by midtskogen
13 Jul 2018 23:43
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 239
Views: 42402

Show off your work

Yes, quarzite slates, 5-600 million years old seafloor.  Countless years of frost and thaw have created a layer of slabs everywhere.  It's still hot here, but we've been seeing more afternoon thunder squalls. Which hasn't really ended the drought (only 58 mm in the past 60 days), but rather started ...
by midtskogen
13 Jul 2018 14:29
Forum: Off-topic Discussions
Topic: Show off your work
Replies: 239
Views: 42402

Show off your work

I was hiking in the  Rondane  mountains last week, and the weather was absolutely stunning. At around 1200 masl there are no trees, but it's still green. a1.jpg Above 1500 masl, however, little survives and there is a desert of rubble.  The rocks are broken into interesting shapes, though. b1.jp...
by midtskogen
13 Jul 2018 13:49
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38234

Unusual weather

I was in the Rondane mountains last week, and it was just blue skies and hot.  Which is quite unusual weather, I've never experienced anything like it in that region.  This was the view from Storronden, 2138 masl.
by midtskogen
13 Jul 2018 02:39
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 430

What exoplanet might reply us back?

But it's important to understand that by "could have life" what is meant by "could" is as in the statement "Venus or Mars could have life".  And the odds that Venus or Mars have life are low, certainly for anything as complex as cellular life or more complex. IF it turn...
by midtskogen
12 Jul 2018 23:35
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38234

Unusual weather

Cool.  Looks like the real thing.  July 2014 had some serious horizon-to-horizon activity several nights over here and I recorded this:

by midtskogen
12 Jul 2018 13:55
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38234

Unusual weather

A fairly close strike today.
x.jpg
by midtskogen
12 Jul 2018 13:40
Forum: Off-topic Discussions
Topic: Unusual weather
Replies: 219
Views: 38234

Unusual weather

Please post whatever you have.

There have been some reports of noctilucent clouds over Northern Europe this summer, but I haven't seen any myself yet.  Some summers they are frequent, other summers they are not.
by midtskogen
07 Jul 2018 10:35
Forum: Off-topic Discussions
Topic: What exoplanet might reply us back?
Replies: 24
Views: 430

What exoplanet might reply us back?

Radio stations for the public have been operating for about a century, but as you say, the power is weak, hardly more than 50 kW.  At stellar distances these radio leaks are likely too faint to be detected practically.
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