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SUNDAY SCIENCE: WHAT WE KNOW ABOUT INTERSTELLAR COMET 3I/ATLAS  
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NASA Jet Propulsion Laboratory
July 3, 2025
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_ An interstellar traveler has been discovered passing through our
solar system. _

An interstellar traveler has been discovered passing through our
solar system., NASA JPL

 

An interstellar traveler has been discovered passing through our solar
system. The NASA-funded ATLAS (Asteroid Terrestrial-impact Last Alert
System) survey telescope in Rio Hurtado, Chile, first reported
observations of comet 3I/ATLAS on July 1, 2025. Since the first
report, additional observations from before the discovery were
gathered from the archives of three ATLAS telescopes around the world
and Caltech’s Zwicky Transient Facility at the Palomar Observatory
in San Diego County, California. These “pre-discovery”
observations extend back to June 14. The fast-moving comet, which
originated outside our solar system around a different star, was
discovered as a tiny speck moving across the vastness of space. When
discovered it was about 410 million miles (670 million kilometers)
away from the Sun, within the orbit of Jupiter.

This is the third interstellar object ever discovered, hence its name
begins with the number 3 and the letter I. Scientists will have
several months to observe and study the comet as it passes through our
solar system and before it exits. As of July 3, 2025, the comet is
just inside the orbit of Jupiter and in late October 2025 it will make
its closest approach to our sun from just inside the orbit of Mars. It
poses no threat to Earth but offers a fascinating and rare opportunity
for scientists to study these interstellar interlopers.

_The JET PROPULSION LABORATORY (JPL) is a federally funded research
and development center
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in La Cañada Flintridge, California
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Crescenta Valley, United States.
[[link removed]] Founded
in 1936 by California Institute of Technology
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researchers, the laboratory is now owned and sponsored by NASA
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Caltech.
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_The primary function of the laboratory is the construction and
operation of planetary robotic spacecraft
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conducts Earth-orbit and astronomy missions. It is also responsible
for operating the NASA Deep Space Network
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(Wikipedia)_

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Can We Fix the Worst Prediction in All of Science?
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Ethan Siegel
Starts With A Bang / Big Think
The measured value of the cosmological constant is 120 orders of
magnitude smaller than what’s predicted. How can this paradox be
resolved?
July 11, 2025

* Science
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* astronomy
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* interstellar traveler
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* comets
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