1–20 of 48 results
Comet Borisov

Solar System

A Detailed View of Our Second Interstellar Visitor

What do we know about the second object to visit us from another stellar system? Detailed Hubble images have given us plenty to consider!

Stellar Science

Faint Repetitions of an Extragalactic Burst

New evidence deepens the mystery of fast radio bursts (FRBs), the brief flashes of radio emission stemming from unknown sources beyond our galaxy.

Pulsar

artist's illustration

An Extreme Pulsar Seen in Gamma Rays

One of the fastest spinning radio pulsars known has now been detected to pulse in gamma rays, too. What can we learn from these new observations?

Supermassive Black hole

Black Holes

The Appearance of a Black Hole’s Shadow

In April of this year, the Event Horizon Telescope captured the first detailed images of the shadow of a black hole. In a new study, a team of scientists has now explored what determines the size and shape of black hole shadows like this one.

Artist's illustration of pulsar Geminga

Cosmology

Should We Blame Pulsars for Too Much Antimatter?

A new study suggests that pulsars are not the source of an unexpected surplus of antimatter particles detected by a space-based experiment. Dark matter remains a viable alternative explanation.

Exoplanets

Two Eyes to Hunt Stray Planet Masses

How can we measure the masses of free-floating planets wandering around our galaxy? A new study identifies one approach that combines the power of two upcoming missions.

Boyajian's Star (art)

Stellar Science

Are There More Stars Like Boyajian’s Star?

Remember KIC 8462852, better known as Boyajian’s star (or you may have seen it referred to as the “alien megastructure” star)? We still don’t have a definitive explanation for this source’s odd behavior — in part because we thought that Boyajian’s star was one-of-a-kind.

Saturn's Rings

Solar System

Planetary History Written in Saturn’s Rings

Saturn is subtly pulsing and oscillating — and those oscillations impose a pattern on its rings that could tell us about the planet’s history.

Pisces–Eridanus stellar stream

Stellar Science

A Nearby Stellar Stream Gets Carded

The stellar stream Pisces–Eridanus may try to pass itself off as a billion years old, but scientists are calling its bluff.

Lensing white dwarf

Stellar Science

An “Impossible” White Dwarf Identified in Kepler Data

Meet the white dwarf that defies all expectations.

Exomoon (art)

Exoplanets

Exomoon or No Exomoon?

Last October, the first discovery of a potential exomoon was announced. But is Kepler-1625b-i an actual moon in another solar system? Or just an artifact of data reduction?

Superluminous supernova (artist's impression)

Stellar Science

A Link Between Fast Radio Bursts, Magnetars, and Supernovae?

What causes the bizarre, extragalactic fast radio bursts we’ve detected over the last decade? An unusually bright supernova may hold the answer.

Buckyball

60 carbon

Hubble Confirms Interstellar Buckyballs

From a jumble of confusing clues in Hubble observations of interstellar space, scientists have picked out evidence of a celebrity molecule: ionized Buckminsterfullerene, or buckyballs.

Super-puff exoplanet

Exoplanets

Inflating a Super-Puff Planet

Super-puffy exoplanets are a problem. They shouldn’t exist — and yet we've detected half a dozen of them. Here's what theory might be getting wrong.

1758

Dwarf Galaxy or Giant Globular Cluster?

AAS Nova brings us the story of a newly discovered cluster of stars. But the jury's out as to whether this group is a typical ancient stellar cluster or something more.

Molecules in space

aas nova

Taking Note of Molecules in Space

What do methylidyne, cyanamide, vinyl alcohol, and rugbyballene all have in common? They’re all molecules that have been detected in space — and they’re all included in a recent census of our universe’s chemical makeup.

Exoplanets

Exploring the Escaping Atmosphere of HAT-P-11b

The atmospheres of planets close to their host stars live a tenuous existence. New observations from the Hubble Space Telescope show signs of a Neptune-like exoplanet’s atmosphere being eroded away.

Astrobiology

Searching for Alien Needles in the Cosmic Haystack

Humanity’s search for signs of extraterrestrial intelligence has been underway, in one form or another, for decades. But how much searching have we really done?

Black Holes

A Black Hole X-Ray Binary Rises

New observations have captured a feeding black hole in our galaxy as it bursts onto the scene.

Stellar Science

Speeding White Dwarfs May Point to Past Explosions

A recent study has discovered three of the fastest stars — white dwarfs — known in the Milky Way. But these stars may be more than just speeders — they might also be evidence of how Type Ia supernovae occur.

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