Pic of the Week: Little Dumbbell Nebula

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Image (Credit): The Little Dumbell Nebula as captured by the Hubble Space Telescope. (NASA, ESA, STScI)

This week’s image comes from the NASA/European Space Agency’s Hubble Space Telescope. It shows what is called the Little Dumbbell Nebula, more formally called  Messier 76, M76, or NGC 650/651, which is about 3,400 light-years away. The image is being shared as part of the celebration of Hubble’s 34th anniversary, which is discussed in this video.

Here is more on the nebula from NASA:

M76 is classified as a planetary nebula, an expanding shell of glowing gases that were ejected from a dying red giant star. The star eventually collapses to an ultra-dense and hot white dwarf. A planetary nebula is unrelated to planets, but have that name because astronomers in the 1700s using low-power telescopes thought this type of object resembled a planet.

M76 is composed of a ring, seen edge-on as the central bar structure, and two lobes on either opening of the ring. Before the star burned out, it ejected the ring of gas and dust. The ring was probably sculpted by the effects of the star that once had a binary companion star. This sloughed off material created a thick disk of dust and gas along the plane of the companion’s orbit. The hypothetical companion star isn’t seen in the Hubble image, and so it could have been later swallowed by the central star. The disk would be forensic evidence for that stellar cannibalism.

The primary star is collapsing to form a white dwarf. It is one of the hottest stellar remnants known at a scorching 250,000 degrees Fahrenheit, 24 times our Sun’s surface temperature. 
The sizzling white dwarf can be seen as a pinpoint in the center of the nebula. A star visible in projection beneath it is not part of the nebula.



Pinched off by the disk, two lobes of hot gas are escaping from the top and bottom of the “belt,” along the star’s rotation axis that is perpendicular to the disk. They are being propelled by the hurricane-like outflow of material from the dying star, tearing across space at two million miles per hour. That’s fast enough to travel from Earth to the Moon in a little over seven minutes! This torrential “stellar wind” is plowing into cooler, slower-moving gas that was ejected at an earlier stage in the star’s life, when it was a red giant. Ferocious ultraviolet radiation from the super-hot star is causing the gases to glow. The red color is from nitrogen, and blue is from oxygen.


Given our solar system is 4.6 billion years old, the entire nebula is a flash in the pan by cosmological timekeeping. It will vanish in about 15,000 years.

TESS is Back Online

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As of May 3, NASA’s Transiting Exoplanet Survey Satellite (TESS) was functioning again after flipping into safe mode back on April 23.

NASA shared this info regarding the shutdown:

The operations team determined this latest safe mode was triggered by a failure to properly unload momentum from the spacecraft’s reaction wheels, a routine activity needed to keep the satellite properly oriented when making observations. The propulsion system, which enables this momentum transfer, had not been successfully repressurized following a prior safe mode event April 8. The team has corrected this, allowing the mission to return to normal science operations. The cause of the April 8 safe mode event remains under investigation.

TESS is currently on an extended mission after accomplishing it primary two-year mission that located 66 confirmed exoplanets and 2,100 exoplanet candidates. Click here for a story about exoplanet HD 21749c, the first Earth-sized exoplanet discovered by TESS.

Based on NASA’s latest information, TESS has already located 440 confirmed exoplanets and 7,147 exoplanet candidates. And now that its back online, the search can continue.

Audit Report: Is NASA Ready for Artemis II?

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The NASA Office of Inspector General (OIG) issued an audit report earlier this week, NASA’s Readiness for the Artemis II Crewed Mission to Lunar Orbit, that expressed concerns about problems with the Artemis I test flight mission in late 2022. For example, the report noted:

…the Artemis I test flight revealed critical issues that need to be addressed before placing crew on the Artemis II mission. In particular, the test flight revealed anomalies with the Orion heat shield, separation bolts, and power distribution that pose significant risks to the safety of the crew…Specifically, NASA identified more than 100 locations where ablative thermal protective material from Orion’s heat shield wore away differently than expected during reentry into Earth’s atmosphere…Beyond the Orion anomalies, the Artemis I launch-induced environment caused greater than expected damage to ML-1 elevators, electrical equipment, enclosure panel doors, and pneumatic tubing, requiring extensive repairs that will cost more than $26 million, roughly 5 times more than the $5 million the EGS Program had originally set aside for postArtemis I launch repairs.

While NASA is already working on repairs and improvements in each of these areas, it still puts a bit of a damper on NASA’s earlier video about all of the successes of Artemis I. NASA has already lost too many astronauts to heat shield issues in the past, so this is a serious matter that needs to be resolved before putting humans in the Orion capsule.

The OIG auditors made six recommendations to NASA management. NASA concurred with these recommendations, but noted that the audit was conducted at a difficult time, stating:

Being audited in the middle of a development process presents several challenges including disruptions to ongoing workflow and priorities due to the reallocation of resources and the coordination challenges associated with audit activities.

Of course, auditors are never really welcome at any point in the process. If they come too late, they are accused of shooting the dead.

NASA conducted the test flight to learn about such issues, so in that sense it was a success. Hopefully, the space agency can make the necessary improvements while keeping the Artemis II mission on track given that it has already been delayed.

Space Quote: Preparing for the Boeing Starliner’s Crewed Mission

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Image (Credit): Boeing’s Starliner spacecraft being placed atop an Atlas 5 rocket at the Cape Canaveral Space Force Station. (United Launch Alliance)

“Today was a was a huge day for our Commercial Crew Program…All the (international) partners and then our whole team polled ‘go’ to proceed to the launch on May 6. Not only that, but we (signed) what we call an interim human rating for Starliner for this crewed flight test. … It was a was a huge deal for NASA and our entire team.”

-Statement by Steve Stich, manager of the Commercial Crew Program for NASA, as quoted by CBS News. After numerous delays, the Starliner’s first Crew Flight Test will take place on May 6. If successful, the Starliner will start bringing astronauts to the International Space Station (ISS) in 2025. This will provide NASA with greater redundancy in its ISS resupply runs.

NASA Experiences Early Success with its Solar Sail

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Image (Credit): Artist’s rendering of NASA’s Advanced Composite Solar Sail System spacecraft in Earth Orbit. (NASA/Aero Animation/Ben Schweighart)

On Tuesday, NASA’s Advanced Composite Solar Sail System was launched from New Zealand aboard a Rocket Lab’s Electron rocket. The successful launch was followed shortly thereafter by the deployment of an 80 square meter experimental solar sail.

In describing the mission, NASA noted:

Like a sailboat turning to capture the wind, the solar sail can adjust its orbit by angling its sail. After evaluating the boom deployment, the mission will test a series of maneuvers to change the spacecraft’s orbit and gather data for potential future missions with even larger sails.

If all goes well, larger sails will be developed to potentially replace large rocket engines and accompanying fuel tanks for future trips to the Moon, Mars, other parts of the solar system, and even interstellar locations.

You might be able to see the solar sail in the night sky as it orbits the Earth, so keep looking up.