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Abstract fractal pattern resembling a cosmic or underwater scene with glowing blue and white textures.

Is Dark Energy Real or Simply a Scary Ghost Story?

Categories, Universe Mysteries, , , , ,

If it is not real, it is an extremely scary ghost story. Unfortunately, the phenomena we call dark energy is real. If it plays out on its current course, we are going to be alone, all alone. The billions upon billions of other galaxies holding the promise of planets with life like ours will be gone. The universe will be much like what they taught our grandparents at the beginning of the Twentieth Century. It will consist of the Milky Way galaxy. All the other galaxies will have moved beyond our cosmological horizon, and be lost to us forever. There will be no evidence that the Big Bang ever occurred.

Mainstream science widely accepts the Big Bang as giving birth to our universe. Scientists knew from Hubble’s discovery in 1929 that the universe was expanding. However, prior to 1998, scientific wisdom was that the expansion of the universe would gradually slow down, due to the force of gravity, and eventually all mass in the universe would collapse to a single point in a “big crunch.” We were so sure that the “big crunch” model was correct, we decided to confirm our theory by measuring it. Can you imagine our reaction when our first measurement did not confirm our paradigm, namely that the expansion of the universe should be slowing down?

What happened in 1998? The High-z Supernova Search Team (an international cosmology collaboration) published a paper that shocked the scientific community. The paper was: Adam G. Riess et al. (Supernova Search Team) (1998). “Observational evidence from supernovae for an accelerating universe and a cosmological constant.” Astronomical J. 116 (3). They reported that the universe was doing the unthinkable. The expansion of the universe was not slowing down—in fact, it was accelerating. Of course, this caused a significant ripple in the scientific community. Scientists went back to Einstein’s general theory of relativity and resurrected the “cosmological constant,” which Einstein had arbitrarily added to his equations to prove the universe was eternal and not expanding. Einstein considered the cosmological constant his “greatest blunder” when Edwin Hubble, in 1929, proved the universe was expanding.

Through high school-level mathematical manipulation, scientists moved Einstein’s cosmological constant from one side of the equation to the other. With this change, the cosmological constant no longer acted to keep expansion in balance to result in a static universe. In this new formulation, Einstein’s “greatest blunder,” the cosmological constant, mathematically models the acceleration of the universe. Mathematically this may work, however, it does not give us insight into what is causing the expansion.

The one thing that you need to know is that almost all scientists hold the paradigm of “cause and effect.” If it happens, something is causing it to happen. Things do not simply happen. They have a cause. That means every bubble in the ocean has a cause. It would be a fool’s errand to attempt to find the cause for each bubble. Yet, I believe, as do almost all of my colleagues, each bubble has a cause. Therefore, it is perfectly reasonable to believe something is countering the force of gravity, and causing the expansion to accelerate. What is it? No one knows. Science calls it “dark energy.”

That is the state of science today. The universe’s expansion is accelerating. No one knows why. Scientists reason there must be a cause countering the pull of gravity. They name that cause “dark energy.” Scientists mathematically manipulate Einstein’s self-admitted “greatest blunder,” the “cosmological constant,” to model the accelerated expansion of the universe.

Here is the scary part. In time, we will be entirely alone in the galaxy. The accelerated expansion of space will cause all other galaxies to move beyond our cosmological horizon. When this happens, our universe will consist of the Milky Way. The Milky Way galaxy will continue to exist, but as far out as our best telescopes will be able to observe, no other galaxies will be visible to us. What they taught our grandparents will have come true. The universe will be the Milky Way and nothing else. All evidence of the Big Bang will be gone. All evidence of dark energy will be gone. Space will grow colder, almost devoid of all heat, as the rest of the universe moves beyond our cosmological horizon. The entire Milky Way galaxy will grow cold as the stars eventually run out of fuel and die. All life will end. How is that for a scary story?

This post is based on my book, Unraveling the Universe’s Mysteries (2012).

A highly magnified electron microscope image of a tardigrade, a tiny water-dwelling micro-animal known for its resilience.

What kind of life might we find on other planets? Extremophiles!

Categories, Life, Universe Mysteries, , , , ,

In the last five decades, we have come to learn that life can be highly adaptable. Starting with the discovery of extremophiles in the 1960s, our entire understanding of how life may have evolved on Earth has been undergoing a reassessment. The early Earth would have presented a relatively inhospitable environment, suggesting to scientists that the earliest forms of life may have been extremophiles.

What is an extremophile? An extremophile is an organism that can thrive in an extreme condition that would be detrimental to most life on Earth. Let us take an example of the most complex of all known extremophiles, the tardigrade.

Tardigrades (also known as “water bears”) are 1 millimeter (0.039 in) long when fully grown, with 4 pairs of legs, each with 4-8 claws also known as “disks.” The animals are prevalent in moss and lichen and viewable with a low-power microscope.

What makes them an extremophile? The tardigrade can withstand temperatures as low as minus 273 degrees Celsius (near absolute zero) and as hot as 151 degrees Celsius (well above the boiling point of water, which is 100 degrees Celsius). It is also able to withstand pressures about six times that found in the deepest ocean trenches and ionizing radiation at doses hundreds of times higher than humans can survive. The big surprise is they can also live in the vacuum of space.

The average human can live without water for about three days, without food for about ten days, if the external environment is hospitable to humans. However, the tardigrade can go without both food and water for more than 10 years. They dry out to the point where they are less than 3% water, but can rehydrate, forage, and reproduce.

The discovery of extremophiles makes finding life on other planets and moons, even within our own solar system, more likely. For example, just recently researchers discovered bacterium, Planococcus halocryophilus OR1, in permafrost (permanently frozen ground) on Ellesmere Island (part of the Qikiqtaaluk Region of the Canadian territory of Nunavut). The organism thrives at 5 degrees Fahrenheit (minus 15 degrees Celsius). This discovery offers clues as to the type of life we may find on Mars or Saturn’s moon Enceladus, both of which contain water ice and surface temperatures well below freezing.

What we humans consider hospitable conditions may actually be lethal to extremophiles. For example, the microorganism Ferroplasma acidiphilum needs large amounts of iron to survive. The iron amounts they thrive in would kill most other life forms. On Earth, many extremophiles live deep underground, which was previously thought to be a dead zone for life, due to the absence of sunlight. However, now we know that the majority of our planet’s bacteria live underground.

The planet Mars has two polar ice caps, which consist primarily of water ice. What might we find as we explore these and the surrounding regions? Saturn’s moon Enceladus appears to have liquid water under its icy surface. Because of Enceladus’s apparent water near the surface, it is a prime candidate for extraterrestrial life in the form of extremophiles.

In my YouTube video, introducing my book, Unraveling the Universe’s Mysteries, I predicted that we would likely find extraterrestrial life in our own solar system within the next twenty years. I stand by that prediction. In fact, I believe I am being conservative.

I suggest we prepare ourselves. We may be on the verge of discovering life in our own solar system.

Sources:

Image: Wikipedia Commons – The tardigrade Hypsibius dujardini

Abstract blue digital background with glowing horizontal lines and light particles.

What is faster than the speed of light? Quantum Entanglement!

Categories, Physics, Universe Mysteries, ,

In 1905, Einstein published his now famous special theory of relativity. It is one of the pillars of modern physics. The special theory of relativity asserts that no physical entity can travel faster than light, since the energy required to enable such a velocity would be infinite. Most of the scientific community extended this concept to communication, asserting that no communication could take place faster than the speed of light. Generally, the scientific community regards light as the upper speed limit of the universe. Until recently, there was no data to contradict this widely held belief.

In 1935, a paper by Albert Einstein, Boris Podolsky, and Nathan Rosen described the EPR paradox (i.e., a thought experiment intended to reveal what they believed to be inadequacies of quantum mechanics) and several papers by Erwin Schrödinger shortly thereafter initiated research into an incredible feature of quantum mechanics, “quantum entanglement.” What made this feature of quantum mechanics incredible is that it appears to allow communication to occur faster than the speed of light. However, we are getting a little ahead of ourselves. Let us first understand what quantum entanglement is and how it relates to communication.

Quantum entanglement is a physical phenomenon that occurs when pairs of particles are generated or interact such that the quantum state of each particle is described relative to each other. Let us consider an example to illustrate this phenomenon. When an electron collides with a positron (i.e., the antimatter counter part of an electron), two photons are emitted. An unusual feature of quantum mechanics is the resultant photons are “entangled.” If one photon exhibits spin up (a component of its angular momentum), the other photon will exhibit spin down. They conserve spin. If you separate the photons and change the spin of either photon, the other will immediately change its spin in a manner to conserve spin. For example, if you change the spin of one photon from spin up to spin down, the other photon, even at a significant distance, will change its spin from spin down to spin up. In other words, they continue to conserve spin.

This phenomenon has been widely verified and the scientific community accepts it as a fundamental feature of quantum mechanics. In recent years, further experimentation related to quantum entanglement has shaken one of the fundamental pillars of modern science, namely, the speed of light as the upper limit that mass or information could travel. Recent experiments (Juan Yin, et al. (2013). “Bounding the speed of `spooky action at a distance”. Phys. Rev. Lett. 110, 260407) have shown that the quantum entanglement information transfer occurs at least 10,000 times faster than the speed of light. It might even be faster. Quantum mechanics holds that the quantum change occurs instantaneously. In other words, the separated particles act as if they were one, even when they are separated by a significant distance. “According to quantum physics, entanglement is independent of distance,” physicist Rupert Ursin of the Austrian Academy of Sciences said in a statement to livescience.com (reference below).

The phenomenon of quantum entanglement has been demonstrated experimentally with photons, electrons, molecules and even small diamonds. It is real and an area of active research in physics. There is no widely held theory within the scientific community that explains how the particles are able to communicate faster than the speed of light. There are numerous speculations, which I will not go into in this article in the interest of remaining factual.

Anyone who can explain quantum entanglement to the satisfaction of the scientific community is likely a candidate for the Nobel Prize. It has been a mystery for almost a hundred years.

Sources:

Image: iStockPhoto

A section of a handwritten sheet music with musical notes and annotations in pencil and red ink.

Was the SETI “Wow!” Signal from Aliens?

Categories, Technology, Universe Mysteries, , ,

Did we actually receive a message from aliens? On August 15, 1977, while working on a SETI (i.e., Search for Extraterrestrial Intelligence) project at the Big Ear radio telescope of The Ohio State University, Dr. Jerry Ehman detected a strong narrow-band radio signal. The signal lasted for 72 seconds, appeared to be non-terrestrial and originating from outside our solar system.

The Big Ear telescope was fixed and used the rotation of the Earth to scan the sky. At the speed of the Earth’s rotation, and given the width of the Big Ear’s observation window, the Big Ear could observe a given point for just 72 seconds. Therefore, a continuous extraterrestrial signal would be expected to register for exactly 72 seconds. The recorded intensity of that signal would show a gradual peaking for the first 36 seconds, as the signal reached the center of Big Ear’s observation window, and then a gradual decrease. This is exactly what was observed.

Amazed at how closely the signal matched the expected signature of an interstellar communication, Dr. Ehman circled the signal on the computer printout and wrote “Wow!” on its side. This comment became the name of the signal.

Unfortunately, SETI has been unable to confirm the signal, but not for lack of trying. The signal was expected to appear three minutes apart in each of Big Ear’s horns, but that did not happen. Dr. Ehman unsuccessfully looked for recurrences of the signal using Big Ear for months after its detection.

In 1987 and 1989, American data analyst, author, and astronomer, Robert H. Gray, searched for the event using the META array at Oak Ridge Observatory, but did not detect it.

In a July 1995 test of signal detection software, SETI League executive director H. Paul Shuch made several drift-scan observations of the Wow! signal’s coordinates with a 12 meter radio telescope at the National Radio Astronomy Observatory, Green Bank WV. No signal was detected.

In 1995 and 1996, Gray searched for the signal using the Very Large Array, which is significantly more sensitive than Big Ear. Again, no signal was detected.

In 1999, Gray and Simon Ellingsen, an Associate Professor in Physics and Radio astronomy at the University of Tasmania, Australia, searched for recurrences of the event using the 26m radio telescope at the University of Tasmania’s Mount Pleasant Radio Observatory. No signal was detected.

Although, SETI was not able confirm the signal, they were able to determine that the initial signal seemed to have originated from the Sagittarius constellation.

The question “Are we alone in the universe?” is a question humankind has been asking for centuries. The “WOW!” signal appears to suggest we may have company.

Detailed anatomical diagram of the human heart with labeled parts including atria, ventricles, valves, and major arteries and veins.

Your Heart Beats 2.5 Billion Times during Your Lifetime

Categories, Life, , ,

Science has discovered that almost all mammals, with the exception of humans, have about the same number of heartbeats in their lifetime, approximately 1 million.

However, humans are outliers in that we get over 2 billion beats. According to Nova (source below), the human heart beats about 100,000 times in one day and about 35 million times in a year. During an average lifetime, the human heart will beat more than 2.5 billion times.

This may seem counter intuitive because when you sleep, your heart rate is slower and when you exercise or become excited, your heart rate is faster. Therefore, based on life style and temperament, you would expect each person to have a different number of heartbeats in their lifetime. According to OMG Facts (source below), you would be wrong. You would also expect different mammals, with different lifespans, to have a different number of heartbeats during their lives. However, this is not the case either.

According to theoretical physicist, Geoffrey West, there exist simple scaling laws relating animal metabolism to body mass. Larger animals live longer, but they metabolize slower, manifested in slower heart rates. Smaller animals live shorter lives, but have heartbeats that are more frequent. For example, animals from rabbits to elephants have lifespans with just about an equal number of heartbeats, approximately one billion.

Therefore, if you equate lifespan to heartbeats, most mammals experience almost the same length of life, with humans being an exception.

The moral of this story is simple. As a human, you have about twice the number of heartbeats of other mammals. Use them wisely.

Sources:

 

Image: Wikipedia Common