Infrared observations by the Hubble Space Telescope reveal jets from a forming star.

herbig-haro object from star wars
The double-lightsaber-like stream in this infrared image from the Hubble Space Telescope is two jets of energized gas ejected from the poles of a young star. When the jets collide with the surrounding dusty gas, they sometimes clear vast spaces, creating knotted clumps called Herbig-Haro objects.
ESA / Hubble & NASA / D. Padgett (GSFC) / T. Megeath (University of Toledo) / B. Reipurth (University of Hawaii)

We receive a lot of press releases here at Sky & Telescope. They span a wide range of interest and quality. This week, a delightful treat popped into our inboxes, in the form of this press release from the Hubble folks. We enjoyed it so much that we decided to post it here for your reading pleasure. Hats off to the public information officers who put this together.

Or, as our editor in chief put it: may the farce be with you.

The Awakened Force of a Star

Perfectly timed for the release of Star Wars Episode VII: The Force Awakens, the NASA/ESA Hubble Space Telescope has imaged a cosmic double-bladed lightsaber. In the center of the image, partially obscured by a dark Jedi-like cloak of dust, an adolescent star shoots twin jets out into space, demonstrating the fearsome forces of the universe.

This celestial lightsaber lies not in a galaxy far, far away, but within our home galaxy, the Milky Way. More precisely, it resides within a turbulent patch of space known as the Orion B molecular cloud complex, which is located just over 1,350 light-years away in the constellation of Orion the Hunter.

Bearing a striking resemblance to Darth Maul’s double-bladed lightsaber in Star Wars Episode One, the spectacular twin jets of material slicing across this incredible image are spewing out from a newly formed star that is obscured from view, cloaked by swirling dust and gas.

When stars form within giant, gaseous clouds, some of the surrounding material collapses down to form a rotating, flattened disc encircling the nascent stars, which are known as protostars. This disc is where a potential planetary system might form. However, at this early stage, the star is mostly concerned with feeding its Jabba-like appetite. Gas from the disc rains down onto the protostar and, once nourished, the star awakens and jets of energized gas from its poles whirl out in opposite directions.

The Force is strong with these twin jets; their effect on their environment demonstrates the true power of the Dark Side with a blast stronger than one from a fully armed and operational Death Star battle station. As they stream away from one another at high speeds, supersonic shock fronts develop along the jets and heat the surrounding gas to thousands of degrees.

Furthermore, as the jets collide with the surrounding gas and dust and clear vast spaces, they create curved shock waves. These shock waves are the hallmarks of Herbig-Haro (HH) objects — tangled, knotted clumps of nebulosity. The prominent Herbig-Haro object shown in this image is HH 24.

Just to the right of the cloaked star, a couple of bright points of light can be seen. These are young stars peeking through and showing off their own faint lightsabers. One hidden, cloaked source, only detectable in the radio part of the spectrum, has blasted a tunnel through the dark cloud in the upper left of the image with a wider outflow resembling “force lightning.”

All these jets make HH 24 the densest concentration of HH jets known in such a small region. Half of the HH jets have been spotted in this region in visible light, and about the same number in the infrared. Hubble’s observations for this image were performed in infrared light, which enabled the telescope to pierce through the gas and dust cocooning the newly-forming stars and capture a clear view of the HH objects that astronomers are looking for.

A slightly different version of this press release appears on the Space Telescope Science Institute website.

Below, you'll find a 3D simulated video zooming in on HH 24. Credit: NASA / ESA / G. Bacon / L. Frattare / Z. Levay / F. Summers (Viz 3D Team, STScI)

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