Why are there 300 sextillion stars. Was it design or chance that one planet of these stars would evolve life?
I say it was chance, and because of that there is no other human life in the Universe other than that on Earth.
no other human life in the Universe other than that on Earth.
You don't know that there is no other human life.
Curiously, all this takes a surprisingly long time. Photosynthesis evolved 1.5 billion years after the Earth’s formation, complex cells after 2.7 billion years, complex animals after 4 billion years, and human intelligence 4.5 billion years after the Earth formed. That these innovations are so useful but took so long to evolve implies that they’re exceedingly improbable.
I say it was chance,
and because of that there is no other human life in the Universe other than that on Earth.
Why are there 300 sextillion stars
Why are there 300 sextillion stars. Was it design or chance that one planet of these stars would evolve life?I say it was chance, and because of that there is no other human life in the Universe other than that on Earth.
I think the biggest great filter you list here would be the jump from prokaryotic to eukaryotic cell structures. Science still does not fully understand how this jump was made, though the most common explanation is that in the past a freak event occurred where some prokaryotic cells began a symbiosis and ended up "integrating" together as a single cell that then became the precursor to all eukaryotic life that followed. this does seem like a very unlikely event to occur and it could be the case that the universe is filled with ancient planets billions of years old teeming with simple prokaryotic analogues that simply never had this rare evolutionary development occur.
It’s possible Silicon or other element based life forms are possible
One of the primary requirements for life is respiration. For carbon life this is easy, oxygen is the most common solution these days but other options exist. Silicon does not react as well with oxygen as carbon does however, so what would silicon life use to respirate?
We don’t know and we can’t know because our knowledge of biology is limited.
Let's go back to the basics of your proposal. Why specifically do you propose silicon based life as a likely possibility?
There are not many other elements which appear to be promising candidates for supporting biological systems and processes as fundamentally as carbon does, for example, processes such as metabolism. The most frequently suggested alternative is silicon Silicon shares a group in the periodic table with carbon, can also form four valence bonds, and also bonds to itself readily, though generally in the form of crystal lattices rather than long chains. Despite these similarities, silicon is considerably more electropositive than carbon, and silicon compounds do not readily recombine into different permutations in a manner that would plausibly support lifelike processes.