SETI Archives

November 30, 2020February 7, 2022 by Matt Williams

Beyond “Fermi’s Paradox” XII: What is the Waterworlds Hypothesis?

Artist's concept of Earth-like exoplanets, which (according to new research) need to strike the careful balance between water and landmass. Credit: NASA

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that the reason for the Great Silence is that many planets out there are just too watery!

In 1950, Italian-American physicist Enrico Fermi sat down to lunch with some of his colleagues at the Los Alamos National Laboratory, where he had worked five years prior as part of the Manhattan Project. According to various accounts, the conversation turned to aliens and the recent spate of UFOs. Into this, Fermi issued a statement that would go down in the annals of history: “Where is everybody?“

This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which includes the possibility that many exoplanets are Waterworlds, where water is so plentiful that life will be less likely to emerge and thrive.

November 22, 2020November 23, 2020 by Matt Williams

Arecibo’s Damage is so Serious and Dangerous, They’re Just Going to Scrap the Observatory Entirely

The Arecibo Radio Telescope. Though it's decommissioned now, Arecibo Data may explain 1977's mysterious Wow! Signal. Image Credit: UCF

This past summer, the Arecibo Observatory suffered major damage when an auxiliary cable that supports the platform above the telescope broke and struck the reflector dish. Immediately thereafter, technicians with the observatory and the University of Central Florida (UCF) began working to stabilize the structure and assess the damage. Unfortunately, about two weeks ago (on Nov. 6th), a second cable broke causing even more damage.

Following a thorough review, the U.S. National Science Foundation (NSF) announced that the observatory cannot be stabilized without risking the lives of construction workers and staff at the facility. As such, after 57 years of faithful service and countless contributions to multiple fields of astronomy, the NSF has decided to commence plans for decommissioning the Arecibo Observatory.

October 11, 2020October 11, 2020 by Matt Williams

The Moon is the Perfect Spot for SETI

In less than four years, NASA plans to land the first woman and the next man on the Moon as part of Project Artemis. This long-awaited return to the Moon is to be followed by the construction of the Lunar Gateway, the Artemis Base Camp, and a program of “sustainable lunar exploration.” The creation of an enduring human presence on the Moon will also create many opportunities for exciting scientific research.

For example, astronomers want to conduct radio astronomy on the far side of the Moon, where telescopes could probe the earliest period of the Universe free of terrestrial radio interference. Taking this a step further, a team of astronomers recently recommended that a radio telescope on the far side of the Moon (or in lunar orbit) could aid in another important area of research: the Search for Extraterrestrial Intelligence (SETI)!

October 8, 2020October 8, 2020 by Andy Tomaswick

Astronomers Will Be Able to Use the World’s Biggest Radio Telescope to Search for Signals from Extraterrestrial Civilizations

Image of the FAST telescope in China — Image of the FAST Telescope in China

Back in April, we reported on how a collaboration between the Chinese Academy of Sciences, the Breakthrough Listen Initiative, and the SETI Institute planned to use the new Five-hundred-meter Aperture radio Telescope (FAST) to search for signs of extraterrestrial life. We now caught up with another of the project scientists to flesh out some more details of their observational plans and what observations they hope to make in the future.

September 27, 2020June 20, 2023 by Matt Williams

Beyond “Fermi’s Paradox” X: What is the Firstborn Hypothesis?

Artist's impression of an exoplanet orbiting a low-mass star. Credit: ESO/L. Calçada

This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which includes the Firstborn Hypothesis that states that humanity could be the first intelligent life to emerge in our galaxy.

September 12, 2020June 20, 2023 by Matt Williams

Beyond “Fermi’s Paradox” IX: What is the Brief Window Hypothesis?

A case study of the inhabitants of Easter Island served in part as the basis for a mathematical model showing the ways a technologically advanced population and its planet might develop or collapse together. Credit: University of Rochester illustration / Michael Osadciw

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that we haven’t heard from aliens because intelligent life only survives for so long.

This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which include the possibility that civilizations only have a “Brief Window” with which to communicate with the cosmos before going extinct.

September 7, 2020September 7, 2020 by Matt Williams

Extraterrestrial Hunters Figure Out a Way to Expand Their Search for Signals by a Factor of 200

Credit: Breakthrough Listen/Univ. of Machester/Daniëlle Futselaar

In 2015, Russian-American billionaire Yuri Milner established Breakthrough Initiatives, a non-profit organization dedicated to advancing space exploration. Central to this effort is Breakthrough Listen, a ten-year international research program dedicated to the Search for Extraterrestrial Intelligence (SETI) and the largest and most sophisticated effort to find intelligent life beyond Earth to date.

In the past five years, the project has made two major data releases (in the June of 2019 and February of 2020) and announced that it found no signs of alien transmissions from the 1,327 nearest star systems. But thanks to an analytical breakthrough recently proposed by researchers from the University of Manchester, it looks as though Breakthrough Listen’s search efforts could be expanded by a factor of more than 200!

August 31, 2020February 7, 2022 by Matt Williams

Beyond “Fermi’s Paradox” VIII: What is the Zoo Hypothesis?

Local Group of galaxies, including the massive members M31 (Andromeda Galaxy) and Milky Way, as well as other nearby galaxies. Credit: Wikipedia Commons/Antonio Ciccolella

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that we haven’t heard from aliens because a super-advanced civilization is deliberately avoiding us.

This became the basis of the Fermi Paradox, which refers to the disparity between high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Since Fermi’s time, there have been several proposed resolutions to his question, which includes the Zoo Hypothesis, which states that aliens are keeping their distance to allow humans to evolve without interference.

August 7, 2020February 7, 2022 by Matt Williams

Beyond “Fermi’s Paradox” V: What is the Aestivation Hypothesis?

An illustration of cosmic expansion. Credit: NASA's Goddard Space Flight Center Conceptual Image Lab

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that the reason we’re not hearing from aliens is that they’re asleep and waiting for the Universe to get better.

This became the basis of the Fermi Paradox, which refers to the high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. But despite seventy years of looking, we still haven’t been able to answer Fermi’s question, leading to multiple proposals as to why this is. Today, we look at the “Aestivation Hypothesis,” which argues that aliens are not dead (or non-existent), they’re just resting!

July 23, 2020February 7, 2022 by Matt Williams

Beyond “Fermi’s Paradox” III: What is the Great Filter?

The Karl Jansky Very Large Array at night, with the Milky Way visible in the sky. Credit: NRAO/AUI/NSF; J. Hellerman

Welcome back to our Fermi Paradox series, where we take a look at possible resolutions to Enrico Fermi’s famous question, “Where Is Everybody?” Today, we examine the possibility that there is something in the Universe that prevents life from reaching the point where we would be able to hear from it.

This became the basis of the Fermi Paradox, which refers to the high probability estimates for the existence of extraterrestrial intelligence (ETI) and the apparent lack of evidence. Seventy years later, we still haven’t answered that question, which has led to many theories as to why the “Great Silence” endures. A popular one is that there must be “Great Filter” that prevents life from reaching an advanced stage of development.