The Fermi Paradox

The Drake Equation honestly surprised me by how plausible the existence of aliens could be somewhere in the universe. However, that could also be used as damning evidence in the claim of extraterrestrial beings. If intelligent intergalactic life is as probable as astronomers believe, how have we not found any yet. It is a simple rebuttal that completely challenges the entire idea of otherworldly creatures. We have spanned millions of light-years throughout space and yet no forms of life have been found. By most accounts of the Drake Equation, some form of life should’ve been found by now. I mean they can’t all be huddled into one corner of the universe just hiding from us! However, I wouldn’t say this is a reason to lose hope. There are still billions of light-years that humans haven’t explored so it is still possible. Just because we haven’t met the expectations of the Drake Equation doesn’t make the chances zero of alien life.

Motionographer The Fermi Paradox
Source
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A Brighter Future for Astrobiology

In the past year, the world of astrobiology has undergone new developments within NASA’s organization. The NASA Astrobiology Program has announced that there is now a new selection of eight new interdisciplinary research teams today, which will help in the pursuit of finding new discoveries in the world of astrobiology. The main purpose of creating these new teams is in order to divide and conquer areas of research such as the “cosmic origins to planetary system formation, origins and evolution of life, and the search for life beyond Earth.” (SOURCE) Personally I am incredibly excited by these developments, because I feel it is incredibly important for us to continue to test our theories about certain origins and planetary life in the universe to see if we can discover new developments as well as revise some of our previous developments concerning the great beyond. Did you know that NASA was planning to do this? Comment down below any of your reactions and thank you for sticking with Angella Astronomy throughout the course of this semester!

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Drake Equation

The Drake equation is an equation used to estimate the amount of civilizations humans can communicate with. The Drake Equation was made by Frank Drake an American astronomer and astrophysicist from Chicago Illinois. The equation takes into factor only planets in the Milky Way Galaxy. The Drake Equation helps try to answer a question we’ve been asking for a long time now, are we alone? The equation tries to show the relative improbability that we are among a universe with trillions of planets and we would be the only planet with advanced forms of life. With there being so many planets that are similar to earth, there must be at least one other planet that has followed a path similar to ours. However to this day there have been no confirmed planets of aliens despite the many reports of them!

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Astrobiology

Astrobiology is the study of life and the universe and the search for life beyond it. Nasa lists astrobiology as having three questions “How does life begin and evolve? Is there life beyond Earth and, if so, how can we detect it? What is the future of life on Earth and in the universe?” and they might be the hardest questions we will ever have that might not ever get a full answer. For centuries philosophers and people alike have asked these questions and we will be asking them for a lot longer. One of the things we must understand when considering these questions it the true size of the universe. There are trillions of planets yet to be discovered that could have formed civilizations but we haven’t been able to get to them. There are so many potential options that its hard to know when we will actually make true progress. The truth of the matter is that the universe is so large that we will most likely never know about aliens in our lifetime, but if more and more people become interested and more kids become scientists we surely will be on the path to know soon!

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Don’t Count Them Out

Tardigrade, facts and photos
Image of a water bear

When we discussed the possibility of life on other planets, the main crux of the idea were the abilities of extremophiles to survive in unimaginable conditions. These guys take the idea of making the best of a bad situation to the next level, comfortably surviving in subzero temperatures or toxic radiation. Thinking about these improbable creatures got me thinking, how exactly do they manage to do it? I mean how could they pull off living in the most extreme environments on Earth?

I thought I would use the tardigrade, also known as the water bear, as my example. This is a tough little guy, as it is known for surviving in temperatures from -328 °F (200 °C) up to 304 °F (151 °C), can easily thrive without water or oxygen, and feels at home at radiation levels thousands of times what humans can handle. However, there are limits to what it can survive under. When the going gets tough, water bears go into a state of cryptobiosis, where all bodily processes stop and it will just sit and wait for conditions to improve. Amazingly, it can pull this off for several decades!! If water bears can survive in these hostile conditions, then I can’t see why it wouldn’t be possible for some creature to pull this off on another planet.

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Religious Pushback to Science: The Scopes Trial

When you first studied biology, you likely saw a picture like this:

Image courtesy of iStock

Though discussing evolution seems commonplace today, it wasn’t always accepted.  Notably, the debate over teaching it in schools bubbled up in our backyard just under one hundred years ago: the 1925 Dayton, Tennessee, Scopes Trial.  In this post, I’ll tell you about the background of the trial and the trial itself.

THE BUTLER ACT

Though Darwinism is now widely accepted, even into the twentieth century, many people didn’t believe it (source).  One such person was John W. Butler, the representative of “Macon, Trousdale, and Sumner Counties in the Tennessee House and Senate” who opposed teaching Darwinism in public schools (source).  In March 1925, the Tennessee legislature passed the Butler Act – named after John Butler – “which declared unlawful the teaching of any doctrine denying the divine creation of man as taught by the Bible” (source).  Teaching Darwinism had been deemed illegal.

ENTER JOHN SCOPES

On May 4, 1925, “[a] Chattanooga newspaper [ran] an item noting that the American Civil Liberties Union [was] seeking teachers willing to challenge the Butler law.  The item [said] that the ACLU [was] ‘looking for a Tennessee teacher who is willing to accept our services in testing this law in the courts.  Our lawyers think a friendly test case can be arranged without costing a teacher his or her job…  All we need now is a willing client,’” and on May 5, “[a] group of town leaders in Dayton, Tenn., read the news item about the ACLU’s search.  They quickly hatch[ed] a plan to bring the case to Dayton, a scheme that they hope [would] generate publicity and jump-start the town’s economy.  They ask[ed] 24-year-old science teacher and football coach John Thomas Scopes if he’d be willing to be indicted to bring the case to trial.  Scopes agree[d], even though he ha[d] only taught biology as a substitute teacher and later [said] he [wasn’t] sure he covered evolution in his classes,” (source).

RECAP

So, evolution was barred from being taught in schools… and Scopes had agreed to be charged for teaching it.

THE LAWYERS

Now that Scopes was being taken to court, it was time to call in the lawyers.  Scopes’ “lawyer was the legendary Clarence Darrow, who, besides being a renowned defense attorney for labor and radical figures, was an avowed agnostic in religious matters.  The state’s attorney was William Jennings Bryan, a Christian, pacifist, and former candidate for the U.S. presidency. He agreed to take the case because he believed that evolution theory led to dangerous social movements. And he believed the Bible should be interpreted literally,” (source).

THE TRIAL

“‘Millions of guesses strung together,’ is how Bryan characterized evolutionary theory, adding that the theory made man ‘indistinguishable among the mammals.’  Darrow, in his attacks, tried to poke holes in the Genesis story according to modern thinking, calling them ‘fool ideas that no intelligent Christian on earth believes,’” (source).  To keep the trial focused, Judge John Raulston limited proceedings to investigate the sole question of whether Scopes had taught evolution – not whether evolution was scientifically accurate – so because Scopes had, in fact, taught Darwinism, he was fined one hundred dollars, and the trial ended (source).  Later, “[o]n appeal, the state Supreme Court upheld the constitutionality of the 1925 law but acquitted Scopes on the technicality that he had been fined excessively.”

THE OUTCOME

Ultimately, “Bryan and the anti-evolutionists claimed victory … [b]ut Clarence Darrow and the ACLU had succeeded in publicizing scientific evidence for evolution,” (source).  In 1967, the Butler Act was repealed.  Evolution was finally welcome in the classroom.

LINGERING QUESTION: SOMETHING FOR US TO PONDER

The Scopes Trial poses an important question: to what extent should we allow religion to bleed into other spheres of life?  Should we allow religion to provide significant pushback on science, as it did when evolution was banned from the classroom?  Should we allow religion to guide our school curricula?  What about our laws?  Let me know in the comments below!

Image courtesy of Me.Me

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A New Discovery in the World of Extremophiles

Location these extremophiles were found (SOURCE)

Geologists have recently discovered an entire new species of extremophiles among us on planet earth, and the location may shock you. More than 500 km away from nutrients and sunlight, these extremophiles have made a home beneath the Antarctic ice shelf (SOURCE). While this discovery was not meant to actually happen, scientists are pleasantly surprised to have discovered yet another incredible species among us on planet earth. Scientists were trying to discover a new sediment from beneath an ice shelf when they hit a boulder that had such life forms clinging to it, described as very similar to sponges. What is most shocking about these creatures is that not only are they able to survive in such an environment but they are able to do so while being completely stationary! Yes that is right, these extremophiles do not even move to search for the food, which is even more shocking because animals that do survive at such depths were previously thought of as needing to have a capability to swim and discover food for themselves. These animals really do put the extreme in extremophile! Are you surprised by this new discovery? Comment down below your thoughts! 

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Gotta be Life out there

Today we will be talking about extremophiles. After learning about all of the potential life that can survive in the harshest of environments, it made me think that there must be life out there. What may seem like a super hot, extremely pressurized environment to us on Venus, may seem like the ideal conditions for heat/pressure loving organisms. Just because us humans wouldn’t be able to survive the heat of Venus or the freezing of Pluto, doesn’t mean that others can’t as well. Just in our solar system there are a handful of worlds that could potentially hold life; ours may be the only one able to support us, but extremophiles could live on a handful of them. So now, think about all the other stars systems and how their worlds may also have the possibility to harbor life. Maybe it isn’t life that we could live under, but surely some extremophiles could. Below is a photo showing extreme conditions that we know life can live in.

By Frontiers

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Hey, Where is Everybody?

When we studied the Drake Equation in class, it was interesting to note that using the maximum possible values for each variable in the equation, there could be as many as 21,000,000 detectable civilizations out there right now waiting to be discovered? If there are so, so many civilizations out there sending communication into space and maybe even traveling through space themselves, where is everybody? This is the basis for the Fermi Paradox.

Given just how massive our galactic neighborhood is, the radio silence from the reaches of the Milky Way is certainly paradoxical. It is a little unsettling just how alone humanity seems to be right now. However, there are many theories as to why this is the case.

For example, maybe colonization simply isn’t the norm for other civilizations in the galaxy. Maybe humans are just power-hungry, land-grabbing outliers in a universe of civilizations that are each content with their own little slice of galaxy. Phrased another way, maybe it is not human ambition, but rather human curiosity that is the outlier.

Then again, maybe discovering extraterrestrial life is just a massively difficult task. At the beginning of the semester, I made a blog post detailing just how painfully slow the speed of light is when compared to the massive scale of even just a single solar system. Even if we had another space-faring civilization as our “next-door” neighbors in the Proxima Centauri system, they would still be five light-years away! At the fastest speed achieved by humans so far (40,000 km/h during the Apollo 11 mission’s return to Earth), it would take over 100,000 years to reach Proxima Centauri (or for someone from Proxima Centauri to reach us). It’s easy to lose sight of just how difficult it might be for life to travel or even just communicate across the stars.

That being said, I don’t want anyone to lost hope. Barring humanity running ourselves into the ground, we have a long time to find an explanation of the Fermi Paradox. It’s still likely that we’re not the only form of life in the universe.

The Fermi Paradox | BLUEsat UNSW
This great infographic outlines some possible explanations for the Fermi paradox.
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Life In The Extremes

If there’s anything I’ve learned in my studies of biology over my education, it’s that life is precarious, delicate, and precious. However, now that I’ve learned more about astrobiology through this course, I’ve also come to know that life is hardy and determined. As Ian Malcom so astutely notes in Jurassic Park, “Life finds a way.” Nowhere is this more true than in the many examples of extremophile life on our world.

Find A Way GIFs - Get the best GIF on GIPHY
You can find this GIF here.

From boiling lakes to nuclear reactors, the places extremophiles call home are often thought to be entirely inhospitable to life. Knowing this, and considering just how inhospitable the other worlds of our solar system seem to be, could it be possible for life to exist throughout our solar system in this form?

For example, psychrophiles (also called cryophiles) are capable of surviving and thriving in temperatures as low as -20 degrees Celsius. Given their proclivity for cold, it may be possible that microscopic psychrophiles are hiding in the red sands of Mars or even deep in the subsurface oceans of Europa. It’s amazing to think that even as life seems so rare and so fragile, it is also capable of appearing places it seems like it couldn’t possibly survive! Perhaps extremophiles like psychrophiles are the key to identifying extraterrestrial life.

This is an image of some psychrophiles found on Earth.
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