Was Mars the Earth of the past and Venus the Earth of the future?

In summary: Thread moved to General Discussion."the only immediate threat to humanity is us"?In summary, the community here in the hopes of better understanding all of your viewpoints on the title of this topic is asking what the human race will do in the hopes of one day acknowledging intelligent life on Earth before it disappears. Some people argue that because of the features on Mars, intelligent life existed on that planet in the past. Others argue that we are the only intelligent life in the universe and that our radio waves will continue travelling forever.
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PiRsq
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I am not a student of astronomy or physics, or any sciences for that matter. But I do have some things I wish to ask the scientific community here in the hopes of better understanding all of your viewpoints as to the title of this topic. First question:

a. Assume that Earth is about to face a mass extinction (either through asteroids or human causes), one in which there will not remain any form of life as we know it (so far). What will we as a human race (collectively, leaving aside differences) do in the hopes that one day a future civilization, either evolving on Earth or from a location outside of the Earth, be able to acknowledge that previously there was intelligent life on this planet?
 
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Thread moved to General Discussion.
 
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"to acknowledge that previously there was intelligent life on this planet"?

Footprints and a flag on the moon should be a good first indicator. And then we have our Mars Rovers...
 
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I guess what I am trying to get at is that we see landmarks in Mars that conspiracy theorists would argue are man-made structures (ie: the face on Mars). So, there could've been life on Mars previously, intelligent life. Now what are the arguments that non-conspiracy theorists have for that statement?
 
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The face on Mars is Cydonia Mensae.

Wikipedia said:
However, today it is generally accepted to be an optical illusion, an example of pareidolia. After analysis of the higher resolution Mars Global Surveyor data NASA stated that "a detailed analysis of multiple images of this feature reveals a natural looking Martian hill whose illusory face-like appearance depends on the viewing angle and angle of illumination"[4]. Similar optical illusions can be found in the geology of Earth; an example is the Badlands Guardian, which resembles a human head wearing a Native American headress[5].
http://en.wikipedia.org/wiki/Cydonia_Mensae
 
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Our radio (and TV) waves will continue forever traveling the universe.

Yes, the humans were crazy.
 
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Was Mars the Earth of the past and Venus the Earth of the future?
All three are vastly different. The mass of Mars is much less than that of Earth or Venus, and Venus is much closer to the Sun, so there is not good comparison.

The only immediate threat to humanity is us.
 

1. What evidence do we have to support the theory that Mars was the Earth of the past and Venus will be the Earth of the future?

There is no concrete evidence to support this theory. However, scientists have studied the geological and atmospheric conditions on Mars and Venus, and have found similarities to the early Earth. This has led to speculation that these planets may have gone through a similar process of evolution.

2. What caused Mars to become uninhabitable while Earth remains habitable?

Mars is smaller and has a weaker magnetic field than Earth, which means it was not able to hold onto its atmosphere and protect it from solar wind. This led to the loss of its atmosphere and water, making it inhospitable for life. Earth, on the other hand, has a stronger magnetic field and has been able to maintain its atmosphere and water.

3. Will Venus eventually become habitable like Earth?

It is unlikely that Venus will become habitable like Earth in the future. Venus has a thick atmosphere with a runaway greenhouse effect, making it the hottest planet in our solar system. It also has a slow rotation and no magnetic field, which would make it difficult for it to develop a habitable environment.

4. Could humans potentially terraform Mars or Venus to make them habitable?

It is currently not possible for humans to terraform Mars or Venus. Terraforming would require significant technological advancements and resources that are not available at this time. Additionally, any changes made to these planets' environments could have unforeseen consequences.

5. How do scientists study the past and future of other planets?

Scientists study the past of other planets by examining their geological and atmospheric conditions, analyzing data from spacecraft and rovers, and conducting simulations and experiments. To predict the future of other planets, scientists use computer models and simulations to understand how their environments may change over time based on various factors such as the sun's evolution and planetary processes.

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