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Updated: 8 hours 54 min ago

Studying the Sun's atmosphere with the total solar eclipse of 2017

Mon, 08/14/2017 - 12:53pm
A total solar eclipse happens somewhere on Earth about once every 18 months. But because Earth's surface is mostly ocean, most eclipses are visible over land for only a short time, if at all. The total solar eclipse of Aug. 21, 2017, is different -- its path stretches over land for nearly 90 minutes, giving scientists an unprecedented opportunity to make scientific measurements from the ground.

New 3-D simulations show how galactic centers cool their jets

Mon, 08/14/2017 - 12:09pm
Scientists have developed new theories and 3-D simulations to explain what's at work in the mysterious jets of energy and matter beaming from the center of galaxies at nearly the speed of light.

Cassini to begin final five orbits around Saturn

Sat, 08/12/2017 - 12:15pm
NASA's Cassini spacecraft will enter new territory in its final mission phase, the Grand Finale, as it prepares to embark on a set of ultra-close passes through Saturn's upper atmosphere with its final five orbits around the planet.

New mission going to the space station to explore mysteries of 'cosmic rain'

Fri, 08/11/2017 - 1:49pm
A new experiment set for launch to the International Space Station will provide an unprecedented look at a rain of particles from deep space, called cosmic rays, that constantly showers our planet. The mission is designed to measure the highest-energy particles of any detector yet flown in space.

NASA watches the Sun put a stop to its own eruption

Fri, 08/11/2017 - 12:48pm
On Sept. 30, 2014, multiple NASA observatories watched a failed solar eruption. Because scientists had so many eyes on the event, they were able to explain how the Sun's magnetic landscape shredded its own eruption.

Galactic winds push researchers to probe galaxies at unprecedented scale

Thu, 08/10/2017 - 5:33pm
After using the Titan supercomputer at Oak Ridge National Laboratory to rule out a potential mechanism for galactic wind, astrophysicists are aiming to generate nearly a trillion-cell simulation of an entire galaxy, which would be the largest simulation of a galaxy ever.

Day to night and back again: Earth's ionosphere during the total solar eclipse

Thu, 08/10/2017 - 2:57pm
Three NASA-funded studies will use the Aug. 21 total solar eclipse as a ready-made experiment, courtesy of nature, to improve our understanding of the ionosphere and its relationship to the Sun.

New observations of Crab Nebula and Pulsar reveal polarized emissions

Thu, 08/10/2017 - 8:21am
New observations of polarised X-rays from the Crab Nebula and Pulsar may help explain sudden flares in the Crab’s X-ray intensity, as well as provide new data for modeling – and understanding – the nebula.

Chaco Canyon petroglyph may represent ancient total eclipse

Wed, 08/09/2017 - 2:01pm
As the hullabaloo surrounding the Aug. 21 total eclipse of the sun swells by the day, an expert says a petroglyph in New Mexico's Chaco Canyon may represent a total eclipse that occurred there a thousand years ago.

Black holes pervade the universe, celestial census indicates

Mon, 08/07/2017 - 3:54pm
After conducting a cosmic inventory of sorts to calculate and categorize stellar-remnant black holes, astronomers have concluded that there are probably tens of millions of the enigmatic, dark objects in the Milky Way -- far more than expected.

Astronauts to bring asteroid back into lunar orbit

Mon, 08/07/2017 - 11:03am
Future space exploration aims to fly further from Earth than ever before. New research examines the robotic phase of the Asteroid Redirect Mission (ARM). In addition to taking manned spaceflights deeper into space than ever before, the proposed mission would also bring some benefit for planetary science.

Primordial black holes may have helped to forge heavy elements

Fri, 08/04/2017 - 1:18pm
Astronomers like to say we are the byproducts of stars, stellar furnaces that long ago fused hydrogen and helium into the elements needed for life through the process of stellar nucleosynthesis. But what about the heavier elements in the periodic chart, elements such as gold, platinum and uranium? Astronomers believe most of these "r-process elements" -- elements much heavier than iron -- were created, either in the aftermath of the collapse of massive stars and the associated supernova explosions, or in the merging of binary neutron star systems.

Twilight observations reveal huge storm on Neptune

Thu, 08/03/2017 - 3:22pm
Striking images of a storm system nearly the size of Earth have astronomers doing a double-take after pinpointing its location near Neptune's equator, a region where no bright cloud has been seen before. The discovery was made at dawn on June 26 as researchers were testing the Keck telescope to see whether it could make useful observations during twilight, a time most astronomers consider unusable because it's not dark enough.

Dark Energy Survey reveals most accurate measurement of universe's dark matter

Thu, 08/03/2017 - 12:06pm
Dark Energy Survey scientists have unveiled the most accurate measurement ever made of the present large-scale structure of the universe. These measurements of the amount and 'clumpiness' (or distribution) of dark matter in the present-day cosmos were made with a precision that, for the first time, rivals that of inferences from the early universe by the European Space Agency's orbiting Planck observatory.

Our solar system's 'shocking' origin story

Thu, 08/03/2017 - 10:31am
According to one longstanding theory, our Solar System's formation was triggered by a shock wave from an exploding supernova. It injected material from the exploding star into a neighboring cloud of dust and gas, causing it to collapse in on itself and form the Sun and its surrounding planets. New work offers fresh evidence supporting this theory, modeling the Solar System's formation beyond the initial cloud collapse and into the intermediate stages of star formation.

Solving the mystery of the sun's hot atmosphere

Thu, 08/03/2017 - 9:19am
The elemental composition of the Sun's hot atmosphere known as the 'corona' is strongly linked to the 11-year solar magnetic activity cycle, a team of scientists has revealed for the first time.

Exoplanet shines with glowing water atmosphere

Wed, 08/02/2017 - 1:47pm
Scientists have found compelling evidence for a stratosphere on an enormous planet outside our solar system. The planet's stratosphere -- a layer of atmosphere where temperature increases with higher altitudes -- is hot enough to boil iron.

New simulations could help in hunt for massive mergers of neutron stars, black holes

Wed, 08/02/2017 - 1:47pm
Scientists have developed new computer models to explore what happens when a black hole joins with a neutron star - the superdense remnant of an exploded star.

Running out of gas: Gas loss puts breaks on stellar baby boom

Wed, 08/02/2017 - 8:33am
Understanding the history of star formation in the Universe is a central theme in modern astronomy. Various observations have shown that the star formation activity has varied through the 13.8 billion-year history of the Universe. The stellar birthrate peaked around 10 billion years ago, and has declined steadily since then. However, the cause of the declining stellar birthrate is still not well understood.

NASA continues to study pulsars, 50 years after their chance discovery

Tue, 08/01/2017 - 3:43pm
These rotating 'lighthouse' neutron stars begin their lives as stars between about seven and 20 times the mass of our sun. Some are found to spin hundreds of times per second, faster than the blades of a household blender, and they possess enormously strong magnetic fields.