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NASA's Solar Dynamics Observatory (SDO) saw both the Moon (upper right) and the Earth (upper left) partially block the sun (Sept. 1, 2016 at 7:33 UT). Just before this image was taken, the Earth totally blocked the sun for a while.
NASA's Solar Dynamics Observatory (SDO) saw both the Moon (upper right) and the Earth (upper left) partially block the sun (Sept. 1, 2016 at 7:33 UT). Just before this image was taken, the Earth totally blocked the sun for a while.

Double Eclipse

On May 9, 2016, Mercury passed directly between the Sun and Earth, making a transit of the Sun. Mercury transits happen about 13 times each century. NASA's SDO studies the Sun 24/7 and captured the eight-hour event.
On May 9, 2016, Mercury passed directly between the Sun and Earth, making a transit of the Sun. Mercury transits happen about 13 times each century. NASA's SDO studies the Sun 24/7 and captured the eight-hour event.

Mercury Transit Across the Sun

The Sun produced three M-class (medium-sized) flares in less than 13 hours and the third one had an interesting flourish at the end (July 22-23, 2016). These were the largest flares the Sun had produced this year as seen by NASA's Solar Dynamics Observato
The Sun produced three M-class (medium-sized) flares in less than 13 hours and the third one had an interesting flourish at the end (July 22-23, 2016). These were the largest flares the Sun had produced this year as seen by NASA's Solar Dynamics Observato

Solar Flares with some Flair

NASA's New Millennium Deep Space 1 spacecraft approaching the comet 19P/Borrelly.
NASA's New Millennium Deep Space 1 spacecraft approaching the comet 19P/Borrelly.

Deep Space 1 Using its Ion Engine (Artist's Concept)

Strands and arches of plasma streamed above the edge of the Sun for over a day, pulled by powerful magnetic forces Aug. 11-12, 2016., observed by NASA's Solar Dynamics Observatory.
Strands and arches of plasma streamed above the edge of the Sun for over a day, pulled by powerful magnetic forces Aug. 11-12, 2016., observed by NASA's Solar Dynamics Observatory.

Playing Along the Edge

Flaring, active regions of our sun are highlighted in this image combining observations from several telescopes. During the observations, microflares went off, which are smaller versions of the larger flares that also erupt from the sun's surface.
Flaring, active regions of our sun are highlighted in this image combining observations from several telescopes. During the observations, microflares went off, which are smaller versions of the larger flares that also erupt from the sun's surface.

NuSTAR Stares at the Sun

One broad active region sported a wonderful example of coiled magnetic field lines over almost a four-day period observed by NASA's Solar Dynamics Observatory during July 15-18, 2016.
One broad active region sported a wonderful example of coiled magnetic field lines over almost a four-day period observed by NASA's Solar Dynamics Observatory during July 15-18, 2016.

Magnetic Coiling

This still image from an animation from NASA GSFC's Solar Dynamics Observatory shows dark strands of plasma hovering above the Sun's surface beginning to interact with each other in a form of tug of war over two and a half days (June 28-30, 2015).
This still image from an animation from NASA GSFC's Solar Dynamics Observatory shows dark strands of plasma hovering above the Sun's surface beginning to interact with each other in a form of tug of war over two and a half days (June 28-30, 2015).

Plasma Push and Pull

A pair of substantial coronal holes were the most notable features on the Sun over the week of Mar. 28 - Apr. 2, 2015. The images were taken in a wavelength of extreme ultraviolet light by NASA GSFC's Solar Dynamics Observatory.
A pair of substantial coronal holes were the most notable features on the Sun over the week of Mar. 28 - Apr. 2, 2015. The images were taken in a wavelength of extreme ultraviolet light by NASA GSFC's Solar Dynamics Observatory.

Two Coronal Holes

This still image from an animation from NASA's GSFC's Solar Dynamics Observatory shows arches of magnetic field lines towered over the edge of the Sun as a pair of active regions began to rotate into view (Apr. 5-6, 2016).
This still image from an animation from NASA's GSFC's Solar Dynamics Observatory shows arches of magnetic field lines towered over the edge of the Sun as a pair of active regions began to rotate into view (Apr. 5-6, 2016).

Towering Arches

Several times a day for a few days this week the Earth completely blocked the Sun for about an hour due to NASA's Solar Dynamics Observatory orbital path (Aug. 25, 2016).
Several times a day for a few days this week the Earth completely blocked the Sun for about an hour due to NASA's Solar Dynamics Observatory orbital path (Aug. 25, 2016).

Eclipse Season for SDO

The two most noteworthy features on the sun this week were a pair of elongated filaments, as seen by NASA's NASA's Solar Dynamics Observatory on Sept. 8, 2016.
The two most noteworthy features on the sun this week were a pair of elongated filaments, as seen by NASA's NASA's Solar Dynamics Observatory on Sept. 8, 2016.

Two Long Filaments

An eruption from the surface of the sun is conspicuous in the lower left portion of this July 6, 2015, image from NASA's Earth-orbiting Solar Dynamics Observatory (SDO).
An eruption from the surface of the sun is conspicuous in the lower left portion of this July 6, 2015, image from NASA's Earth-orbiting Solar Dynamics Observatory (SDO).

Solar Activity Seen at Sunspot Site Tracked by Mars Rover

The structure of the Sun's corona shows well in this image from NASA's Solar TErrestrial RElations Observatory (STEREO).
The structure of the Sun's corona shows well in this image from NASA's Solar TErrestrial RElations Observatory (STEREO).

Full Disk Image of the Sun, March 26, 2007

X-rays stream off the sun in this first picture of the sun, overlaid on a picture taken by NASA's Solar Dynamics Observatory, taken by NuSTAR.
X-rays stream off the sun in this first picture of the sun, overlaid on a picture taken by NASA's Solar Dynamics Observatory, taken by NuSTAR.

Sun Shines in High-Energy X-rays

This side-by-side rendering of the Sun at the same time in two different wavelengths of extreme ultraviolet light helps to visualize the differing features visible in each wavelength (Dec. 10-11, 2015). This image is from NASA's Solar Dynamics Observatory
This side-by-side rendering of the Sun at the same time in two different wavelengths of extreme ultraviolet light helps to visualize the differing features visible in each wavelength (Dec. 10-11, 2015). This image is from NASA's Solar Dynamics Observatory

Comparing Wavelengths

Sparked by a medium-sized (C-class) flare, a long, magnetic filament burst out from the Sun, producing one of the best shows that SDO has seen (Aug. 31, 2012).
Sparked by a medium-sized (C-class) flare, a long, magnetic filament burst out from the Sun, producing one of the best shows that SDO has seen (Aug. 31, 2012).

Magnificent Outburst

This still image from an animation from NASA GSFC's Solar Dynamics Observatory shows a single plume of plasma, many times taller than the diameter of Earth, spewing streams of particles for over two days (Aug. 17-19, 2015) before breaking apart.
This still image from an animation from NASA GSFC's Solar Dynamics Observatory shows a single plume of plasma, many times taller than the diameter of Earth, spewing streams of particles for over two days (Aug. 17-19, 2015) before breaking apart.

Eiffel Tower Plume

NASA's Solar Dynamics Observatory shows a long coronal hole has rotated so that was temporarily facing right towards Earth (Mar. 23-25, 2016). Coronal holes appear dark when viewed in some wavelengths of extreme ultraviolet light.
NASA's Solar Dynamics Observatory shows a long coronal hole has rotated so that was temporarily facing right towards Earth (Mar. 23-25, 2016). Coronal holes appear dark when viewed in some wavelengths of extreme ultraviolet light.

Elongated Coronal Hole

This artist's concept shows NASA's two Voyager spacecraft exploring a turbulent region of space known as the heliosheath, the outer shell of the bubble of charged particles around our sun.
This artist's concept shows NASA's two Voyager spacecraft exploring a turbulent region of space known as the heliosheath, the outer shell of the bubble of charged particles around our sun.

Voyagers in the Heliosheath (Cropped)

A small, but complex mass of plasma gyrated and spun about over the course of 40 hours above the surface of the Sun taken by NASA's GSFC Solar Dynamics Observatory on Sept. 1-3, 2015.
A small, but complex mass of plasma gyrated and spun about over the course of 40 hours above the surface of the Sun taken by NASA's GSFC Solar Dynamics Observatory on Sept. 1-3, 2015.

Tangled up in Blue

The magnetic field lines of three active regions in close proximity to one another interacted with each other over two and a half days (Feb. 8-10, 2016). This image is from NASA's Solar Dynamics Observatory.
The magnetic field lines of three active regions in close proximity to one another interacted with each other over two and a half days (Feb. 8-10, 2016). This image is from NASA's Solar Dynamics Observatory.

Solar Triumvirate

A large, dark coronal hole at the bottom of the Sun has been the most dominant feature this week (Jan. 29, 2014) as seen by NASA GSFC's Solar Dynamics Observatory.
A large, dark coronal hole at the bottom of the Sun has been the most dominant feature this week (Jan. 29, 2014) as seen by NASA GSFC's Solar Dynamics Observatory.

Substantial Coronal Hole

One active region at the edge of the Sun pushed out about ten thrusts of plasma in just over a day long period as observed by NASA's Solar Dynamics Observatory on July 9-10, 2016.
One active region at the edge of the Sun pushed out about ten thrusts of plasma in just over a day long period as observed by NASA's Solar Dynamics Observatory on July 9-10, 2016.

Weak Thrusts

Three substantial coronal holes rotated across the face of the Sun the week of Sept. 8-10, 2015 as seen by NASA's Solar Dynamics Observatory. Coronal holes are areas where the Sun's magnetic field is open and a source of streaming solar wind.
Three substantial coronal holes rotated across the face of the Sun the week of Sept. 8-10, 2015 as seen by NASA's Solar Dynamics Observatory. Coronal holes are areas where the Sun's magnetic field is open and a source of streaming solar wind.

A Triumvirate: Three Coronal Holes

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