Comet C/2013 UQ4 (Catalina) first looked like an asteroid when NASA's NEOWISE team first observed it on December 31, 2013. These exposures were taken that day, when the comet was at a distance of about 2.9 AU from the sun.
A composite image of the spiral galaxy NGC 4258 showing X-ray emission observed with NASA's Chandra X-ray Observatory (blue) and infrared emission observed with NASA's Spitzer Space Telescope (red and green).
This infrared image from NASA's Spitzer Space Telescope shows N103B -- all that remains from a supernova that exploded a millennium ago in the Large Magellanic Cloud, a satellite galaxy 160,000 light-years away from our own Milky Way.
Studied by astronomers, Serpens Cloud Core is one of the youngest collections of stars ever seen in our galaxy. This infrared image combines data from NASA's Spitzer with shorter-wavelength observations from the Two Micron All Sky Survey.
Astronomers have found cosmic clumps so dark, dense and dusty that they throw the deepest shadows ever recorded. A large cloud looms in the center of this image of the galactic plane from NASA's Spitzer Space Telescope.
This composite image shows one of the clusters, NGC 2024, which is found in the center of the so-called Flame Nebula about 1,400 light years from Earth. Astronomers have studied two star clusters using NASA's Chandra and infrared telescopes.
The magnetic field of our Milky Way galaxy as seen by ESA's Planck satellite. This image was compiled from the first all-sky observations of polarized light emitted by interstellar dust in the Milky Way.
This frame from an animation shows the coldest brown dwarf yet seen, and the fourth closest system to our sun. Called WISE J085510.83-071442.5, this dim object was discovered through its rapid motion across the sky.
Kepler-186f, the First Earth-size Planet in the Habitable Zone (Artist's Concept)
This artist's concept depicts Kepler-186f, the first validated Earth-size planet to orbit a distant star in the habitable zone, a range of distance from a star where liquid water might pool on the planet's surface.
Moon or Planet? The 'Exomoon Hunt' Continues (Artist's Concept)
Researchers have detected the first 'exomoon' candidate -- a moon orbiting a planet that lies outside our solar system. Using a technique called 'microlensing,' they observed what could be either a moon and a planet -- or a planet and a star.
The galaxy NGC 4395 is shown here in infrared light, captured by NASA's Spitzer Space Telescope. This dwarf galaxy is relatively small in comparison with our Milky Way galaxy, which is nearly 1,000 times more massive.
This mosaic reveals a panorama of the Milky Way from NASA's Spitzer Space Telescope. This picture covers only about three percent of the sky, but includes more than half of the galaxy's stars and the majority of its star formation activity.