Search results for planetesimals

Astronomy Aug 3, 2026

A 21-hour dip could help explain Tabby's star's decade-long dimming mystery

Since 2016, an ordinary-looking F-type star called KIC 8462852, nicknamed Tabby's star, has behaved anything but ordinarily. In a new study published in the Monthly Notices of the Royal Astronomical Society on July 6, researchers ...

Astronomy Aug 2, 2026

DESI side project reveals the spectra of disintegrated exoplanets

Using spectral data from the Dark Energy Spectroscopic Instrument (DESI), astronomers have gained some of the clearest evidence yet that white dwarf stars are accreting debris from disintegrating exoplanets. Captured while ...

Astronomy Jul 28, 2026

Tabby's star may be orbited by a planetary-mass companion

By analyzing data from NASA's Transiting Exoplanet Survey Satellite (TESS) and conducting new radial velocity measurements, U.K. and French astronomers have found evidence that the mysterious Tabby's star may be orbited by ...

Planetary Sciences Jul 18, 2026

NASA's Psyche mission delivers Mars flyby data, time-lapse video

The spacecraft aced its encounter with Mars. Now, mission scientists are studying a trove of data from the flyby in preparation for its arrival at asteroid Psyche in 2029.

Planetary Sciences Jun 24, 2026

Did gravitational tides cause Earth's extinctions?

Life on Earth took a long evolutionary journey that eventually created us, the purportedly intelligent species that dominates the planet. But there was no grand plan or design, only happenstance, nature and luck. Life on ...

Astronomy Jun 16, 2026

Asteroid or comet? Meteor or meteorite? How to identify and classify the rocks you see streaking through the sky

Have you ever been out at night and seen a streak of light blast across the sky and disappear? Ever wonder where that shooting star came from, or how it got to be in your sky?

Astronomy Jun 16, 2026

Young disk around WRAY 15-1880 may contain a primitive planetary system

Italian astronomers have used the Very Large Telescope (VLT) to perform polarimetric observations of the star WRAY 15-1880 and its young circumstellar disk. Results of the new observations, presented June 10 on the arXiv ...

Astrobiology Jun 8, 2026

Cosmic bombardment may have opened Earth's crust for prebiotic chemistry

Asteroids and planetesimals regularly bombarded Earth between about 4.6 billion and 3.5 billion years ago, during the Hadean and Archean eons. Because few rocks today are more than 4 billion years old, our understanding of ...

Astrobiology Jun 3, 2026

How Jupiter may have redirected life's ingredients toward Earth 4.5 billion years ago

NASA-supported scientists have provided new information about how the early Earth may have acquired some elements necessary for the planet to become habitable. They also suggest a new role for Jupiter in the distribution ...

Planetary Sciences May 22, 2026

Just outside Jupiter, one region may have forged six meteorite parent bodies

When the solar system formed, a disk of gas and dust orbited the young sun. Over the course of millions of years, the dust gradually clumped together to form kilometer-sized chunks known as planetesimals. Some grew into planets, ...

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