Planetary alignment happening in February: Planets make 'string' across California skies
Take advantage of a special 6-7 planet alignment from Earth's perspective. Planets 'line up' in the skies over California in ...
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Astronomers Reveal Largest Collection of Comets Outside Earth’s Solar System Ever Found
Harvard and Smithsonian (CfA), and its Submillimeter Array (SMA), were critical for identifying a cache of belts surrounding other stars beyond the sun where comets may reside. Regions around 74 stars ...
Astronomers announce largest collection of comets found outside our solar system
For the first time, astronomers have imaged dozens of belts around nearby stars where comets and tiny pebbles within them are ...
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Urban spelunking: Revisiting now-reopened Yerkes Observatory
When we visited Yerkes Observatory in 2021, it was closed and faced a daunting road back, yet its director had big plans. It ...
Why Is Pluto Not A Planet?
Why is Pluto no longer a planet? Discover the real reason behind Pluto’s reclassification as a dwarf planet and the science that led to this change.
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Why Is Pluto No Longer a Planet?
Pluto isn't alone—it's part of the Kuiper Belt with possibly hundreds of other planet-sized objects. Because Pluto hasn't achieved gravitational dominance in its region, the International Astronomical ...
Asteroid 2024 YR4 on NASA's Radar: What Are Near Earth Objects (NEOs)?
NASA and ESA monitor asteroid 2024 YR4, which has a 1.2% chance of impacting Earth in 2032. Learn about Near-Earth Objects ...
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The Mystery of Arrokoth: What NASA Didn’t See Coming
NASA’s New Horizons mission changed our understanding of the outer solar system. After its famous Pluto flyby, it traveled ...
For children: The universe tells the story of Earth, its most special planet
Uranus has the craziest tilt in your Solar System. Its tilt is about ninety-eight degrees. That means its north pole is ...