Red dwarfs and Earth-like planets

[Cody]

Interesting article - there are oodles of red dwarfs (shouldn't that be dwarves?).

[Mad Dan Eccles]

"Dwarfs" is the 'proper' plural (or dwerrow, even)... Tolkien popularized the word "Dwarves". http://grammarist.com/usage/dwarfs-dwarves/

[Cody]

Hmm... dwarfs does seem to be current for stellar objects. But I reckon it should be dwarves in normal usage.
Wasn't Tolkien a high-brow professor of English language, and something of an expert in the translation of Germanic words?

[CommRLock78]

Perhaps Tolkien preferred dwarves since it follows the f => v pattern for plurals ending with f.

[Tricky]

Arrrrgggggghhhhhhh!!!!!!!!!!

You just reminded me of a time when I lost many moons to the research of singular to plural and back again. I don't ever want to see this page on Wikipedia again:  Plural form of words ending in -us

The plural of Elvis is Elvii

[PhantorGorth]

... I lost many moons to the research ...

From testing a Death Star OXP?

[CommRLock78]

Arrrrgggggghhhhhhh!!!!!!!!!!

You just reminded me of a time when I lost many moons to the research of singular to plural and back again. I don't ever want to see this page on Wikipedia again:  Plural form of words ending in -us

The plural of Elvis is Elvii

the old -us ending .

We don't have cactuses here in the S.W., but we do have cacti .

[drew]

Red Dwarfs are extremely common in the universe. Whether they have habitable planets remains quite the debate.

Personally I'm hoping they will have, I've got a couple of books that depend upon that possibility.

Cheers,

Drew.

[PhantorGorth]

Red Dwarfs are extremely common in the universe. Whether they have habitable planets remains quite the debate.

If they do exist they will have to be close to the star to be warm enough and therefore likely to be tidally locked with one face constantly facing the sun. (like the Moon is to the Earth.) This then means there would be a twilight strip around the planet that is habital between the extreme heat of the Sun facing side and the deep freeze of the far side.

[drew]

If they do exist they will have to be close to the star to be warm enough and therefore likely to be tidally locked with one face constantly facing the sun. (like the Moon is to the Earth.) This then means there would be a twilight strip around the planet that is habital between the extreme heat of the Sun facing side and the deep freeze of the far side.

You're absolutely correct, sir!

Cheers,

Drew.

[CommRLock78]

Red Dwarfs are extremely common in the universe. Whether they have habitable planets remains quite the debate.

If they do exist they will have to be close to the star to be warm enough and therefore likely to be tidally locked with one face constantly facing the sun. (like the Moon is to the Earth.) This then means there would be a twilight strip around the planet that is habital between the extreme heat of the Sun facing side and the deep freeze of the far side.

This is my understanding as well, but I think we shouldn't forget the possibility of companion moons, which could alleviate the tidal locking problem . (i.e., if two bodies were tidally locked to each other there would be day and night).

[PhantorGorth]

Red Dwarfs are extremely common in the universe. Whether they have habitable planets remains quite the debate.

If they do exist they will have to be close to the star to be warm enough and therefore likely to be tidally locked with one face constantly facing the sun. (like the Moon is to the Earth.) This then means there would be a twilight strip around the planet that is habital between the extreme heat of the Sun facing side and the deep freeze of the far side.

This is my understanding as well, but I think we shouldn't forget the possibility of companion moons, which could alleviate the tidal locking problem . (i.e., if two bodies were tidally locked to each other there would be day and night).

It all depends on what wins tidally. The moon would eventually move futher away and it's effect would reduce whereas the sun's effect would remain fairly constant so the sun would win in the long run.

Another point is you can have a system further out (even beyond the normally referred habital zone) and still be warm enough to support life by adding enough CO2 or other greenhouse gases to the atmosphere. Tidal locking would not be an issue for these types of planets.

[GGShinobi]

Another point is you can have a system further out (even beyond the normally referred habital zone) and still be warm enough to support life by adding enough CO2 or other greenhouse gases to the atmosphere. Tidal locking would not be an issue for these types of planets.

You know what all this means, do you?? We are surrounded by hostile aliens who envy us for our powerful yellow sun!!! Most likely penguine-like beings capable of hacking computers with their bare feet!!! We need a Death Star to protect ourselves NOW!!! AAAAaaaaaaaaaaaaaaaaaahhhhhhhhhhhhh....
*runs of in panic*

[CommRLock78]

It all depends on what wins tidally. The moon would eventually move futher away and it's effect would reduce whereas the sun's effect would remain fairly constant so the sun would win in the long run.

Another point is you can have a system further out (even beyond the normally referred habital zone) and still be warm enough to support life by adding enough CO2 or other greenhouse gases to the atmosphere. Tidal locking would not be an issue for these types of planets.

Interesting point. It would be great to find the simulator like this one that Pleb mentioned months back, which included moons as well (the one I know of that I linked to is great, but the simulated planet lacks a moon).

You know what all this means, do you?? We are surrounded by hostile aliens who envy us for our powerful yellow sun!!! Most likely penguine-like beings capable of hacking computers with their bare feet!!! We need a Death Star to protect ourselves NOW!!! AAAAaaaaaaaaaaaaaaaaaahhhhhhhhhhhhh....
*runs of in panic*

Penguins...

Edit: K-type stars have a lifetime over twice the lifetime of G-type star, and don't run the risk of having their Habitable Zone in range of the tidal locking zone.

Orange dwarfs are about three to four times as abundant as sun-like stars, making planet searches easier

[CommRLock78]

A slight digression - here's a little plot of Planck's Law using four different typical stellar type temperatures from F,G,K, and M.

I have a hypothesis that plants on earth are green because that's where the peak intensity for the sun is, however, it will be a hard thing to prove or disprove until we have some other examples of plants from other sun types.