Interstellar Archives

What’s Hidden Inside 3I/ATLAS? Astronomers Reveal Another Unexpected Discovery About Our Latest Interstellar Visitor

Micah Hanks·March 10, 2026

3I/ATLAS, the unusual interstellar comet that continues to fascinate astronomers, appears to be keeping an intoxicating cosmic secret, new research has revealed.

NASA Official Issues Statement on 3I/ATLAS as Images Reveal the Interstellar Object Has ‘Grown’ a Striking New Feature

Micah Hanks·September 18, 2025

Astronomers have obtained new images of the mysterious interstellar object 3I/ATLAS that reveal a new feature: the fastest comet ever observed has now grown a tail.

Frozen Worlds, Hidden Clues: Why We Should Search for Technosignatures on Non-Habitable Planets

Avi Loeb·March 22, 2025

Astronomers should search for technosignatures on planets that are not conducive to life. Harvard astronomer Avi Loeb explains why.

Interstellar Sun-Divers: Probing the Sun’s Corona for Exotic Artifacts

Avi Loeb·August 19, 2024

NASA's Parker Solar Probe and other space observatories could be used to study interstellar "Sun-divers." What else could they reveal?

Unraveling ‘Oumuamua’s Anomalous Acceleration: Could This Interstellar Object Have Been Manufactured?

Avi Loeb·August 16, 2024

Harvard astronomer Avi Loeb revisits the argument for the interstellar object 'Oumuamua potentially being technologically manufactured.

‘Oumuamua Was Younger Than We Thought, New Findings Suggest. Here’s Why That Matters.

Avi Loeb·August 1, 2024

Was the mysterious interstellar object 'Oumuamua younger than we thought? New findings suggest it was, raising new questions about its possible origins.

NASA is Investigating a Strange Series of Coded Messages from Space. They’re Coming from a Familiar Source.

Micah Hanks·December 15, 2023

NASA engineers were reportedly left baffled recently after receiving a perplexing series of coded messages from a point in space nearly 15 billion miles from Earth, according to a recent update shared by the U.S. space agency.

The Illusion of Superiority: A Salute to Nature

Avi Loeb·August 25, 2023

Our illusion of superiority relative to nature is unwarranted. In science, humility is a prerequisite for learning something new.

Will Disclosure Occur Before Scientists Obtain Evidence of UAP?

Recruiting Panelists from the Bar at Harvard Square as The Galileo Project Turns Two

Avi Loeb·August 7, 2023

Is it easier to learn what lies in interstellar space from scooping the bottom of the Pacific Ocean than from politicians in Washington DC?

Diary of an Interstellar Voyage: Parts 31-33 (June 25-26 2023)

Avi Loeb·June 28, 2023

Might an iron peanut be worth ten thousand spherules, or nothing at all? Avi Loeb and the Galileo Project team's expedition to the Pacific waters off Papua New Guinea draws to a close.

Diary of an Interstellar Voyage: Parts 28-30 (June 25-26 2023)

Avi Loeb·June 27, 2023

As the Galileo Project team's expedition winds down, Avi Loeb provides a series of updates on the search for spherules believed to be associated with an interstellar meteor.

Diary of an Interstellar Voyage: Parts 25-27 (June 24-25 2023)

Somewhere Over the Rainbow

Avi Loeb·June 25, 2023

Avi Loeb presents a new series of updates on the search for spherules believed to be associated with an interstellar meteor retrieved during the Galileo Project team's expedition.

Diary of an Interstellar Voyage: Parts 21-23 (June 22-23, 2023)

The Hunt for More IM1 Spherules

Avi Loeb·June 23, 2023

The Galileo Project team continues its search for evidence of an interstellar object in this installment of "Diary of an Interstellar Voyage."

Diary of an Interstellar Voyage: Parts 18-20 (June 21, 2023)

The Discovery of Spherules from the Path of the First Recognized Interstellar Meteor, IM1

Avi Loeb·June 21, 2023

Magnetic spherules are detected under the microscope by Avi Loeb and the Galileo Project team in this latest installment of 'Diary of an Interstellar Voyage.'

Diary of an Interstellar Voyage: Parts 14-17 (June 19-20, 2023)

Corroded Iron and Volcanic Debris in IM1’s Path

Avi Loeb·June 20, 2023

Corroded iron, volcanic debris, and evidence of magnetic particles turn up in IM1’s Path in this latest update from the Galileo Project's expedition.

Diary of an Interstellar Voyage, Parts 11-13: June 18, 2023

Avi Loeb·June 19, 2023

More materials are recovered, and new questions surface, in this combined three-part entry covering Day 8 (June 18, 2023) of the Galileo Project team’s expedition.

Diary of an Interstellar Voyage, Parts 9 & 10: June 17, 2023

You Can't Make a Lemonade Without Lemons

Avi Loeb·June 17, 2023

The Galileo Project continues its recovery of material from the ocean floor during its expedition to recover an interstellar object off the coast of Papua New Guinea.

Diary of an Interstellar Voyage: Parts 7 & 8

Strange Wires and Diverse Fragments in the Pacific Ocean Site of the First Interstellar Meteor

Avi Loeb·June 16, 2023

Strange Wires and other fragments are found during the Galileo Project's expedition to recover an interstellar object from the ocean floor.

Diary of an Interstellar Voyage: Parts 5 & 6

First Sample of Fragments from the Pacific Ocean Floor

Avi Loeb·June 16, 2023

This combined entry covers Days 5 and 6 of the Galileo Project's expedition to recover a interstellar object from the Pacific Ocean floor.

Diary of an Interstellar Journey: Part 4

Scooping the Ocean Floor

Avi Loeb·June 14, 2023

Scooping the Ocean Floor: The Galileo Project team's magnetic sled is lowered to bottom of the Pacific in the fourth installment of "Diary of an Interstellar Journey."

Diary of an Interstellar Voyage: Part 3

Arrival at Silver Star

Avi Loeb·June 14, 2023

Harvard Astronomer Avi Loeb and the Galileo Project team begins its efforts to retrieve an interstellar object at the bottom of the Pacific in this third installment of "Diary of an Interstellar Journey."

Diary of an Interstellar Voyage: Part 2

Seeking Extraterrestrial Artifacts In The Pacific Ocean

Avi Loeb·June 13, 2023

This second installment in a series documents Harvard Astronomer Avi Loeb and the Galileo Project's expedition to recover an interstellar object from the floor of the Pacific Ocean.

Diary of an Interstellar Voyage: Part One

It’s Easier to Seek For Potential Facts About Extraterrestrials on the Ocean Floor than to Get Them from Government.

Avi Loeb·June 12, 2023

Harvard Astronomer Avi Loeb documents the Galileo Project's expedition to attempt the recovery of an interstellar object from the floor of the Pacific Ocean.

Will Your Home Be Hit by a Meteorite?

Avi Loeb·May 15, 2023

Could your home be hit by a meteorite? It isn't a frequent occurrence... but that doesn't mean it never happens.

April 19th Senate Hearing on UAP: The Shot Heard Round the World

Avi Loeb·April 19, 2023

On April 19, 2023, exactly 248 years after the Lexington-Concord Battle, a public Senate hearing on UAP is to be held by the Senate Committee on Armed Services.

Exotic Propulsion: Technological Probes From the Final Frontier

Avi Loeb·March 30, 2023

By studying interstellar objects, we may learn about new exotic propulsion methods that will make it easier for us to venture into interstellar space.

The Allegory of the Cave: An Interstellar Interpretation

Avi Loeb·March 15, 2023

In this installment of "Our Cosmic Neighborhood," Harvard astronomer Avi Loeb takes a look at an ancient philosophical dialogue in the context of interstellar artificial intelligence.

Interstellar Romance: Connecting Our Human Affairs to the Stars

Avi Loeb·February 20, 2023

For the first time in the history of astronomy, connecting our human affairs to the stars might make complete sense.

Science Is Better Than Politics and Popularity Contests

Avi Loeb·February 8, 2023

The elemental composition of the first interstellar meteor will be decided by a mass spectrometer, not by the number of likes it gets on Twitter.

Imagine Interstellar: Humanity’s Path to Becoming an Interstellar Species

Avi Loeb·January 27, 2023

"Interstellar travel favors the scientifically inclined, exploring civilizations," says Harvard astronomer Avi Loeb in his latest Op Ed.

Seeking Immortality in Space: Encounters With ‘Interstellar Memorabilia’

Avi Loeb·December 27, 2022

Like prehistoric cave paintings, finding interstellar extraterrestrial devices might indicate that the quest for immortality is universal to all sentient beings past and present throughout the Milky Way galaxy.

The State of the Universe: Lost Civilizations from Our Cosmic Past

Avi Loeb·November 22, 2022

Future interstellar travel could reveal that the "State of the Universe" is far more significant than our present concerns over worldly political matters at home.

The NASA UAP Study: A New Calculation On the Fly

Avi Loeb·October 25, 2022

Astronomer Avi Loeb shares his thoughts following a recent meeting in Washington with members of the forthcoming NASA UAP Study.

Technologies of Interstellar Origin: Picking the “Fruits” of Intelligence

Avi Loeb·September 28, 2022

Finding the products of technological engines produced by intelligence from afar could inspire humans to focus on our ambitious future in space.

The Bright Side of the Moon

Avi Loeb·July 27, 2022

Interstellar travel would require major investments. Instead, first we should examine the objects that arrive in our solar system from interstellar space.

Survival of the Optimist: Designing Our Indefinite Future in Space

Avi Loeb·June 24, 2022

To paraphrase Darwin’s “survival of the fittest”, when it comes to our future in space, everything may hinge on “survival of the optimist.”

Voyager Spacecraft Will Soon Power Down for Their Final Mission Into the Beyond

Micah Hanks·June 23, 2022

This week, we look at two of the most iconic spacecraft ever to leave Earth and go into space in search of the unknown, and what NASA has said about the final phase of their historic mission.

Interstellar Kites: Galactic Surfing on Light?

Avi Loeb·May 26, 2022

Here’s hoping that they are some interstellar environmentalists out there who have already started to clean our cosmic neighborhood.

The First Interstellar Meteor Had a Larger Material Strength Than Iron Meteorites

Avi Loeb·April 27, 2022

The first interstellar object to make its way to Earth may have had properties that exceeded even those of iron meteorites.

Scooping Interstellar Fragments from the Ocean Floor

Avi Loeb·April 20, 2022

On April 6, 2022, the U.S. Space Command tweeted a formal letter confirming a meteor as originating from outside the solar system.

How The Pentagon Helped Confirm an Interstellar Object Made Its Way to Earth

Micah Hanks·April 13, 2022

This week we'll be looking at how a meteor that might have gone unnoticed was revealed to have interstellar origins, with help from the Pentagon.

What is Dark Matter?

Avi Loeb·April 1, 2022

With questions like those surrounding dark matter, we should resist the temptation of explaining away anomalies based on past knowledge.

Into the Cosmic “Webb”: The Search for Interstellar Interlopers

Micah Hanks·February 17, 2022

The James Webb Space Telescope could do more than just give us glimpses of distant alien worlds; it may even help us spot a few interstellar visitors.

Second Interstellar Visitor Borisov Is The Most Pristine Comet Ever Observed

Tim McMillan·March 30, 2021

New research released today suggests the second interstellar object ever detected, 2I/Borisov, was likely the most pristine comet...

‘Oumuamua Not an Alien Spaceship, Likely a Piece of an Exoplanet, New Study Says

Tim McMillan and Micah Hanks·March 19, 2021

Two scientists from the University of Arizona believe they have solved the mystery behind ‘Oumuamua, suggesting its a piece of an exoplanet.