Scientists discover planet orbiting star

What would be the habitable zone if there were silicon based life in that system?

They never seem to think of these things

 

The general measure is the appearance of water.

Temperatures must generally be sustainable at some point of the year in liquid form. So temperatures must be consistently above freezing and below boiling for at least part of the year to lie within the "hospitable" zone.

 

I wonder if any of these planets have subterranean water because that can change things since it is protected from radiation and heat from above and can be heated geothermally.

Just because something is outside the habitable;e zone doesn't mean there is no life. They are looking at Europa thinking it might have life and its outside the habitable zone

 

Yes but the idea is that it is extremely unlikely.

Also, I believe the habitable zone refers to life sustenance on the surface.

So even geothermal vents wouldn't technically count. They're talking about the most likely places to find life, not all the possible places. We're trying to narrow it down.

 

1) Jon, what? Tell me you were saying something that makes sense and I am just reading it wrong.

2) Habitable? Ha! It's already populated with a race of advanced warmongers! The only reason we haven't gotten transmissions from them is that they have us shielded. I say we launch the fleet at once, we need to invade before they do.

 

Um no actually the moon has a rotational period the same as its orbital period.  That is why the same side is always facing us.

A lunar day is about the same a Terran month


And yes Neon you read that right.

 

@ Neon , ummm.... I don't know if you understood it, but it looks pretty clear to me...

He was saying that Moon's "day" is only 4 minutes shorter than the Earth or whatever. I was pointing out that the Moon rotates on its axis at a much slower rate than the Earth, and doesn't even have "days" because it rotates in rhythm with the Earth. Which is why it has such a drastically reduced gravitational pull. The speed of rotation of a mass, as well as its "mass" is what creates most of its gravitational pull, in addition to its magnetic and electromagnetic fields.

So I was pointing out that the Moon rotates much more slowly and has a correlation in its weaker gravitational pull. Not to mention the mass differences that also effect such things.

I'm no astrophysics major, but that's my basic grasp of what's occurring from what I've read, studied, and heard.

EDIT: I didn't know that we never see the dark side of the moon. I just thought the rotation was so slow that it was rarely seen and when it was it was too dark to observe.

Learn something every day. I guess that explains Apollos 13-17 and their exploration of the dark side.

Seems to me there must be some forces involved and the Moon rotates in that manner for a reason. Especially since the dark side is so pocked, it's been orbiting in this manner for millions of years.

And it's orbit has increased during that time... lots of things that I'm ignorant about in Space.'

EDIT 2: So regarding Light Speed Travel... supposing it was possible to equal the speed of light. Couldn't you technically not be conscious during that travel without dying? I mean technically you're keeping pace with light, so wouldn't it not travel within whatever ship you were traveling in? And wouldn't it exert some crazy ass forces?

What are the latest theories regarding it? I mean, technically, we have some technology that could translate into speed-of-light travel, and Neon is a physics major, so he might know some.

I've read a lot about Ion Pulse Thrusters as interplanetary propulsion, and technically, given a large enough distance, it should theoretically be able to get near to the speed of light. It would take years though.

So Neon, any theories?

 

Rotational period and gravity have no correlation.  Venus is close to the same mass as earth but rotates much more slowly.  It has .9 G I think but Venusian days are a few hundred Terran days in length.

The reason the moon always faces the same direction is due to something called tidal locking where a satellite artificial or not becomes aligned with the most massive part towards the planet causing the rotational period and orbital period to be the same.

I don;t know about the reason for the occurrence of more impact craters on the dark side but I think it might have to do with earth attracting meteorites enough to divert them inwards so a meteor passing on the inner side would be pulled away form the moon and ones on the far side get pulled towards the moon

 

sucks to be the moon

 

An interesting fact is that due to conservatio of angular momentum the moon is causing the eartsh rotation to slow down and the moon to get further from the planet.

23 hour days and a moonless sky in our future

 

yes no stupid reflected sunlight from the moon lighting up my nights

 

No living things to feed upon either

 

life will still exist without the moon

 

Not really. Besides by that time the sun will have engulfed the planet anyway.

 

if not the moon with it

 

Most notions that life will look similar to life here comes from archaic theories like "The Great Chain of Being" some explain that theory in religious terms or even pseudo-scientific ways. (GCB there is a natural hierarchy of organism, with humans at the top and lower organism at the bottom, demonstrating the natural progression Divinity(religious) Evolutionary(pseudo-scientific))

That's why in most Scifi films higher beings are usually bipedal, 2 handed creatures with generally human characteristics, because those traits were seen as fundamental traits of superior beings 'being that we are superior to the animals'. Most of the racism we know of today comes from that same mentality, they looked to the great chain of being to rank the "3" races of mankind {Caucasoid, Negroid, Mongoloid}, and all of the subcategories: Civilization, Culture, Religious Traditions, Appearance, Technology, these were the criteria. For a time, Native American weren't considered human, since there only 3 races, they had to be animals, and that is why they were so heavily exterminated (actual killing, not disease and such) read Bartolme de las Casas for 1st hand accounts. What creeps me out is the fact that Race, was meant to be Race like lord of the rings style, thus Mulatto (half- black/white) is Portuguese for Mule, it was a legend that mixing the 2 would make a sterile child...

Looking at the Protoss, and how they are superior to humans, yet still possess most of the criteria.

-------------
To get back on track, life is quite capable of many things. Just looking at Earth, there are many many variations. When something goes extinct, the extant repopulate. It is all a matter of chance.

All animals with Mitochondria, are just a fluke that survived. Animal cells have a metabolism that is too slow to survive as multicellular organisms, we produce around 2 ATP (energy) per cycle. Mitochondria are ancient bacteria, that could produce 28-36 ATP (rough calc), per cycle. An ancient, single celled, animal cell ancestor swallowed a mitocondria, and instead of the mitochondrion dying, it survived inside the cell, eating the animal cells food, and producing tons of energy. After generations, they (we) became symbiotic, all because it didn't result in death for either cell. Mitochondria produce 32 ATP per cycle for us, the rest of the cell basically protects and houses the mitochondria. Mitochondria still have their own DNA, which mutates at its own rate, independent from 'our' own.
Hybrid descendants which became multicellular could survive, because they could produce more energy (multiple cells block diffusion, since there is less surface area to absorb, higher energy yield can balance that somewhat)
----Leading Theory on Mitochondrial incorporation.
(side note, some other creatures aquired mitochondria, or other organisms in different ways)
Fluke after fluke is what produced us, 1 change in the past, could completely alter everything today.

---------------------
:good: Thumbs up to the University of California system (which I am a student of, and taught me that mitochondria theory)

 

which is about our day

 

and what is why mitochondria have DNA (yours is the same as your mother's is the same as her mothers or at least so similar that variations only occur after many many generations

No ijffdire the lunar day is about four weeks NOT the same as our day. The moon appears to move for th same reason the sun does: the earth is rotating

 

Thet's why I fear for any single alien lifeform to be discovered by us. They'd cut it to pieces for science without thinking twice. And you wonder why we don't have visitors, only the ones with extremely deadly technology (or extremely deadly themselves like Xenomorphs) could come here and survive

 

@BirdofPrey

You inherit Mitochondria from your mother, because the Egg Cell contains the mitochondria, while the Sperm Cell has its mitochondria in the base of the tail which breaks off. Mitochondria are contained inside of the cells, and when they divide, they still populate the cells. Thus Mitochondria is inherited in a straight line without intuerruption.
Mitochondria still carry out the functions of their DNA, and sometimes there are errors, just like when we reproduce.

There is a probabilty that your DNA will be copied wrong, the more DNA you have the more frequently errors will occur. Mitochondria don't have a ton of DNA, so the errors are less frequent. (there are likely other factors that also contribute to this, which I am unaware of.)
------------
check the MITOCHONDRIAL MIGRATION, to see the maps of human migrations, really cool in my opinion