A few million years of light silt and sand driven by fast winds creates precisely the same patterns as water.
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A lot of evidence has piled up supporting the idea that there was water worldwide. It doesn't have to come from water itself. Geoologists found areas that clearly look like dried-up lakes, rivers, and oceans.
A few million years of light silt and sand driven by fast winds creates precisely the same patterns as water.
NASA is exploring this. But with no atnosphere anymore, where do the fast winds come from?
Two small points: keep in mind that there are many more geologists, from around the planet than just those directly associated with NASA; secondly, we have no doubts that sedimentary rocks are present on Mars.This is why NASA geologists are not giving up on the possibility Mars might have sedimentary rocks, fossils, or anything else showing life was previously on the planet.
You are equivocating a potentially life-protecting magnetosphere with no magnetosphere. That's cute, but not very helpful to a productive discussion.However, Mars has always had only 1/3 the mass of Earth to retain atmosphere, and Mars has always received only 1/4 of the solar heating of Earth to energize chemical processes, and Mars has never had a life-protecting magnetosphere of Earth.
I would be interested in you backing that up with evidence. You are assuming that the single example we have of an evolving biosphere, Earth, is typical. You are assuming that it would take a three or four billion years to move from first life to metazoan organisms of equivalent complexity to Cambrian flora and fauna. That may be the case, but we currently lack the data to make the absolute statement quoted above.Mars may have some of the most simple forms of life, but it never had enough water, heat, or atmosphere to have reached something like Earth's Cambrian period.
And there was certainly not a magnetosphere comparable to the Earth's magnetosphere, which is believed created by the fusion of a Mars' sized proto-planet with the earth eons before life developed.
1. In what way do you think the Earth's magnetosphere was not comparable with that of Mars? They are thought (with a high confidence level) to have shared these characteristics:The Earth's magnetic field was established 3.5 billion years ago.
Mars was like the Earth in the following respects (there are others) :Mars could never have been like Earth.
But then, "Earth-like" has become a very loose characteristic in some astronomy circles...primarily to gain public attention.
Incorrect. The Hadean extended from the origin of the Earth to 4.0 Ga. You claim there were no solid rocks throughout this time. However, age dating and isotope analysis of zircon crystals from Jack Hills in Australia and other locations, demonstrates that crustal rocks existed within the Hadean.There were not even solid rocks during the Hadean phase.
Citations requested for the emboldened assertions.The Earth's magnetic field was established 3.5 billion years ago. The solar wind flux at that time was about 100 times the value of the modern Sun, so the presence of the magnetic field helped prevent the planet's atmosphere from being stripped away, which is what probably happened to the atmosphere of Mars. However, the field strength was lower than at present and the magnetosphere was about half the modern radius.
There was no life possible in this region of the Solar System during the period that Mars had an effective magnetosphere.
Citations requested that justify this absolute statement. Alternatively, acknowledge that "A few million years of light silt and sand driven by fast winds might create similar patterns as water," is a more accurate statement.A few million years of light silt and sand driven by fast winds creates precisely the same patterns as water.
I speculate a lot of planets may have had some elementary life arise, and then in typical situations in typical planets that would soon enough end up with that elementary life becoming extinct due to normal physics as is commonplace in normal solar systems. For instance, a planet even around a very stable star like ours would gradually loose it's surface water, naturally, due to just typical solar wind alone, over time, unless the planet has an usually strong magnetic field. (ask if you are interested in articles on thisNASA now has evidence and proof Mars is not completely dry and in fact used to have a lot more liquid water than it does now. How do they know? By actually finding such water on the planet, as well as ice in what looks like a mostly dried up lake. At least one river has been found. Even an underground lake was discovered years later. This is why NASA geologists are not giving up on the possibility Mars might have sedimentary rocks, fossils, or anything else showing life was previously on the planet. What do you think?
Well, I'm aware of the distances to planets (astronomy is a very old and life long interest of mine, and I'm sort of a storage bin of a huge number of facts and information from the field, if you like). Jupiter is close enough both to deflect many dangerous comets and asteroids that might otherwise bombard us even today, and also it's close enough to migrate Earth out of it's current orbit in a deadly way...except that will not happen due to the cancelling effects of the other gas giants, in our very fortunate configuration we have. Would you like articles to read on any of it -- please ask about a specific thing, since there are actually like 10-20 aspects that matter. I wasn't discussing dinosaurs of course in that post, but only the most elementary life forms at all, the early forms that at least on Earth accounted for vast stretches of time before more advanced forms evolved. Continental drift and volcanism are thought to have been very helpful to life as we know it here though, by the way.Halbihh:
It is interesting that you call Jupiter "nearby." Venus is the closest gas planet to Earth.
The International Astronomy Union changed Pluto's status as a planet partly because its orbit is not really a separate orbit as it spends part of the year in front of Neptune. The other reason is its size, so the IAU's categorical name is dwarf planet. (This definition makes Mercury the minimum size to be a planet.)
I also want to see links to legitimate citations, but you overestimated how long ago Earth's tectonic plates drifted apart. The reason dinosaur bones have been found on several continents is they lived on Pangea - the "supercontinent" that was most of Earth's land mass during the early Triasstic period.
New Jersey?And, for that matter, moving and living in the most remote, hostile regions of Earth would be easier than colonizing any other planet.
Clarification pleas.
Do you believe in aliens ie non-humans from other planets?
The word alien has nothing to do with outer space. It means anyone who is in a foreign land. When I was in Europe, I was an alien to Europeans. So yes, I believe in aliens, because the word describes all people. (Look it up in the dictionary if you don't believe me. This is the English definition.)
With that out of the way, the answer to your question is no. Nothing has ever been brought back from an extraterrestial planet (which could only be Mars) and found to have organic material. What I believe is Mars certainly could have at one time been able to support life, but can't do so anymore.
Please excuse a couple of pedantic corrections.The word alien has nothing to do with outer space. It means anyone who is in a foreign land. When I was in Europe, I was an alien to Europeans. So yes, I believe in aliens, because the word describes all people. (Look it up in the dictionary if you don't believe me. This is the English definition.)
With that out of the way, the answer to your question is no. Nothing has ever been brought back from an extraterrestial planet (which could only be Mars) and found to have organic material. What I believe is Mars certainly could have at one time been able to support life, but can't do so anymore.
It is interesting that you call Jupiter "nearby." Venus is the closest gas planet to Earth.
The International Astronomy Union changed Pluto's status as a planet partly because its orbit is not really a separate orbit as it spends part of the year in front of Neptune. The other reason is its size, so the IAU's categorical name is dwarf planet. (This definition makes Mercury the minimum size to be a planet.)
With that out of the way, the answer to your question is no. Nothing has ever been brought back from an extraterrestrial planet (which could only be Mars) and found to have organic material. What I believe is Mars certainly could have at one time been able to support life, but can't do so anymore.
What do you mean by clearing its orbital space?
I knew you were not talking about dinosaurs. I was just saying the continental drift happened much later. The timing is proven by where fossils of animals that lived during the Triassic period were discovered.
Your avatar is a giveaway you love astronomy. Is it the Milky Way?
Just to make sure it's clear, the earth has always had continental drift. Since the earth has a molten mantle then the plates, comprising the crust, are in constant motion. Moving apart, moving into, subducting, etc. This has been going on since the cooling of the crust during the Hadean eon.
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