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21 votes

Could alien species with blood based on different elements eat the same food?

Ultimately, we have one example of a tree of life and associated amino acids and proteins, so a totally alien biochemistry is unlikely to interface well with Earth biochemistry, fullstop, regardless ...
jdunlop's user avatar
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16 votes

How much time is needed to judge an Earth-like planet to be safe?

This is a Frame Challenge: Define "safe" Millions of people died from COVID-19 in 20201 and that's after billions of years of evolution, millions of years of experience, and thousands of ...
JBH's user avatar
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15 votes
Accepted

Could alien species with blood based on different elements eat the same food?

Your question is incomplete Humans can eat styrofoam and not die, despite it having absolutely no nutritional value. Humans can die from drinking too much water, which they otherwise require to live. ...
JBH's user avatar
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14 votes

How do floating plants get their trace nutrients?

They eat them. Carnivorous plants are hardly unknown in the real world. They derive their energy primarily from sunlight but, as in your question, the trace elements they can't get from their soil ...
Cadence's user avatar
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13 votes
Accepted

How do floating plants get their trace nutrients?

Something needs to get those trace elements into the air. Some examples: Strong winds/hurricanes/tornadoes Volcanoes/tectonic activity Regular comets sprinkling dust Meteor impacts Industrial ...
sdfgeoff's user avatar
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13 votes

How do floating plants get their trace nutrients?

Dust on the winds Your world has some easily accessible patches of the trace elements on its surface, likely in the middle of a large desert. These rocks formations that contain the trace elements are ...
vinzzz001's user avatar
  • 1,104
11 votes

How do floating plants get their trace nutrients?

birds poop on them Or some other, more alien, kind of flying creature. They eat nutrient-containing bugs, seeds etc. (or alien equivalent) and then fly up and build their nest on a nice convenient ...
N. Virgo's user avatar
  • 6,025
10 votes

How do floating plants get their trace nutrients?

Airborne pineapples I present to you the Tillandsia genus, in the Bromeliaceae family, the same as pineapples. They are also commonly known as air plants because they obtain nutrients and water from ...
André L F S Bacci's user avatar
9 votes

How much time is needed to judge an Earth-like planet to be safe?

Not all risks can be accounted for, but colonists are (by self-selection) far more comfortable with risk than most people At the end of the day, the thing about life: nobody gets out alive. Frontier ...
William Walker III's user avatar
6 votes
Accepted

Could an exomoon be bombarded by electromagnetic radiation from its parent gas giant and still be habitable enough for life to evolve?

The gas giant orbits a blue giant with constant Carrington Events To understand "constant Carrington events" we need to start with the Carrington event. The Carrington Event was the most ...
JBH's user avatar
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5 votes

How much time is needed to judge an Earth-like planet to be safe?

1 year for basic safety, 20 for high safety. Lots of animals and insects act on some sort of cycle and only are active in certain seasons. There's certainly a risk that some sort of weird lifeform ...
Nepene Nep's user avatar
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5 votes

Possible binding agent for Chlorine in blood?

Chlorine is hyper reactive- so literally everything is a binding agent. Proteins. Fats. It clumps up and is dead matter. If you had that in blood, you need a entirely different chemistry to build the ...
Pica's user avatar
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4 votes

How do floating plants get their trace nutrients?

They don't need them Unless you're proposing that these plants have been transported to your world via a portal from some other planet, chances are good they have lived all their lives in this ...
elemtilas's user avatar
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3 votes

How much time is needed to judge an Earth-like planet to be safe?

Two or three generations. The answer by Richard Kirk mentioned the historical example of cancer by x-rays. There could be subtle things on this planet which interfere with fertility and the germline. ...
o.m.'s user avatar
  • 117k
3 votes

How much time is needed to judge an Earth-like planet to be safe?

Months It depends largely on the organization culture and if individuals are allowed to decide for themselves. As others have said 'safe' is very subjective. Assuming they can send out scout drones ...
Menno van Lavieren's user avatar
3 votes

How do floating plants get their trace nutrients?

Not "in the air" per se but air has "impurities" In our world the air has solid particles in suspension. Moreover rain is not pure water, but brings with it some impurity. The idea ...
Rad80's user avatar
  • 401
3 votes

Possible binding agent for Chlorine in blood?

Binding Chlorine isn't an issue, binding it within a carbon-chain chemistry and having it A. unbind later and B. not totally wreck the carbon-chain molecules it interacts with on the other hand ...
Ash's user avatar
  • 45.6k
2 votes

Possible binding agent for Chlorine in blood?

Hemoglobin Hemoglobin already has allosteric binding sites for chlorine. Some exotic variant could certainly bind and hold chlorine for use in cells.
Nepene Nep's user avatar
  • 40.1k
2 votes

How much time is needed to judge an Earth-like planet to be safe?

I assume the risk is something quite unexpected. They have not landed on something looking like a massive lava flow that feels still warm in parts, and seems to come from the distinctly conical ...
Richard Kirk's user avatar
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2 votes

Could alien species with blood based on different elements eat the same food?

Its a definite maybe One problem would be deficiency diseases if something needed here only as a trace element is required in orders-of-magnitude larger quantities by the aliens. For example ...
nigel222's user avatar
  • 11.8k
1 vote

How much time is needed to judge an Earth-like planet to be safe?

Never Remember Deathworld? Or SMAC/X storyline? Either consisted of a sentient planetmind, that in case of Deathworld decided to oppose the base with everything it could, and in case of SMAC/X ...
Vesper's user avatar
  • 8,117
1 vote

How much time is needed to judge an Earth-like planet to be safe?

How safe do you want it to be? I will assume that "safe" means "it is no more likely to kill you prematurely than Earth is." There is a reason why there are discussions of "...
Mary's user avatar
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