Life might be more common in the universe than we thought.

"White dwarf stars, once considered inhospitable, may actually support habitable exoplanets. New climate simulations reveal that fast-rotating planets around white dwarfs retain more heat, avoiding the excessive cooling seen in slower-orbiting worlds. Credit: SciTechDaily.com" (ScitechDaily, Could Alien Life Thrive on Planets Orbiting Dead Stars? New Study Suggests Yes)

The search for extraterrestrial intelligence and extraterrestrial lifeforms continues. Researchers suggest that also dead star planets can host lifeforms. So the star that gives energy to those lifeforms must not star at all. Things like white dwarfs, neutron stars, and black holes can also maintain or even make life on planets that orbit them possible. The material disks around neutron stars and black holes can give energy to planets that can form after the supernova explosion. 

But intelligent lifeforms can also drive material to those star remnants' surfaces. The ion cannons can drive ions to neutron stars, black holes, and white dwarfs. And that thing reduces impact energy. That material can form a fusion reaction on those star remnants' surfaces as it forms in natural events. The civilization can also use things like the neutron star's magnetic field and its pulsar beam as an energy source. 

Things like samples from asteroid Bennu make scientists think about life again. The particles of life are more common than researchers expect. 

If the planet that orbits in the habitable zone and has the right chemical and physical conditions can exist long time enough that means the lifeforms can turn intelligent. The lifeforms are not forming as randomly as we might hope. And that means. That there can be more intelligent civilizations in the universe than we expect. But then we can look at the stars around us. There is one candidate. That could host similar lifeforms as Earth. That is the van Maanen 2. That is a white dwarf at a distance of 14,2 light-years from Earth. Those stars' lifeforms might not live if they cannot get out of their system. 

 The white dwarf can be a remnant of a similar star to our sun. That means there is a possibility that the civilization from that solar system is left to the universe. But then we must remember that our solar system and its planets are also the remnants of some ancient stars. This means the planet's formation can begin after the supernova or nova eruption. 

But then again to the intelligence. We know that there must be something that makes evolution favor intelligence rather than a great number of descendants. The fluctuation of the environment caused the situation that the lifeforms must have the ability to learn things and then apply those things in the ever-changing environment. If the planet's environment is too stable. A large number of descendants is enough for a species' survivability. 

But before intelligence, there must be conditions that make long organic molecules possible. "New research shows that fluctuating environmental conditions helped chemical mixtures self-organize and evolve in structured ways, challenging the notion of chaotic early chemical evolution." (ScitechDaily, Not So Random After All: Scientists Uncover Surprising New Clues to the Origin of Life)

Requirements for life are: 

1) Chemical systems can continuously evolve without reaching equilibrium.

2) Selective chemical pathways prevent uncontrolled complexity.

3) Different molecular species exhibit synchronized population dynamics.

(ScitechDaily, Not So Random After All: Scientists Uncover Surprising New Clues to the Origin of Life)

Life is a complex thing. There are lifeforms on Earth that use volcanic temperature as an energy source. The tree and human might look far different than we might believe. Both of those things live on the same planet. They both have cells with mitochondria and DNA. But that is the only thing that combines those creatures. When we look at things like fishes they also live on the same planet as we do. 

But for those creatures air is poison. They die on dry lands. And for a creature that uses volcanic temperature as its energy source comes sunlight, which can kill it. Same way in caves live organisms without pigment. Those organisms die in the straight sunlight. That means. There are species. 

That live in total darkness. They are aliens to each other. The first organisms on Earth were not different from modern organisms when we see their fossils. But those lifeforms lived on the planet. There was no free oxygen in the oceans or atmosphere. Then plankton organisms release oxygen to oceans and that caused the first extinction. 

The reason for the first two mass extinctions was the conditions where lots of oxygen was released into oceans. That raised the mass of creatures that didn't form or release oxygen. Then the number of oxygen releasers decreased and that thing decreased the oxygen level in the oceans. Then the carbon dioxide is released into the air. Rising temperatures decrease the oxygen level in oceans. Changes in conditions caused the extinctions that forced some species out from water to dry lands. 

The Late Ordovician extinction can happen when there is too much oxygen in the water. Or when the climate turned colder the ocean pulled lots of oxygen in the cold water. Then the climate turned warm again and that released oxygen from the water. That caused a situation where oxygen turned high and low. But there are many theories about that first extinction. 

In the second case, the  Late Devonian extinction was similar to the Ordovician. The animals disappear from oceans for some reason. That made the perfect conditions for plankton growing. Maybe there formed lots of plankton that caused the explosive growth of species like sharks and other sea creatures. Then something destroyed plankton. The reason for that can be some kind of cloud that disturbed their photosynthesis. 

That turned those oxygen producers the users of oxygen. That caused the extinction of the species that ate plankton. Then that extinction continued to higher animals like sharks. And when those creatures fell to the bottom of the ocean they released lots of carbon dioxide into the ocean and atmosphere. That raises the temperature on Earth and weakens the ocean's ability to connect gasses to water. 

https://scitechdaily.com/could-alien-life-thrive-on-planets-orbiting-dead-stars-new-study-suggests-yes/

https://scitechdaily.com/are-we-alone-scientists-uncover-evidence-that-intelligence-may-be-inevitable/

https://scitechdaily.com/not-so-random-after-all-scientists-uncover-surprising-new-clues-to-the-origin-of-life/

https://en.wikipedia.org/wiki/Extinction_event

https://en.wikipedia.org/wiki/Van_Maanen_2