Sky Beauties of 2023
Space remains one of humanity’s most profound discoveries, and 2023 marked significant strides toward unravelling the mysteries of these vast depths. With increasingly advanced telescopes and novel space observatory technologies, we now have the opportunity to peer deeper into the cosmos and marvel at its enigmatic wonders. In this compilation, we showcase some of the most remarkable, captivating, and scientifically significant space and astronomy photographs from 2023. From cosmic ballets and stellar formations to asteroids and nebulae, these images bring extraordinary celestial phenomena to our screens. Captured throughout the year, these breath taking moments contribute to a deeper comprehension of the enigmas concealed within deep space and the staggering intricacy of the universe. The pivotal scientific revelations and visual spectacles of 2023 promise to lead us on a voyage of exploration into the boundless splendour of the cosmos.
Ring Nebula
A cherished subject among astronomy photographers, the Ring Nebula is a planetary nebula with a distinctive ring shape, located in the constellation Lyra. It is formed from the remnants of a dying star that has shed its outer layers over a distance of 2,200 light-years. In 2013, Hubble’s image of the nebula caused a sensation, but in the past year, the James Webb Space Telescope (JWST) unveiled a new image teeming with amazing detail.
In the past, planetary nebulae were perceived as straightforward spherical formations with a fading star at their core. However, contemporary observations reveal that many planetary nebulae display stunning intricacies. The image captured by JWST hints at the presence of another star concealed within the intricate folds of the nebula, potentially influencing the dying star at the nebula’s heart. This additional gravitational force adds layers of complexity to the dispersion of its outer layers into the vastness of space.
The rings of Uranus
If you looked at this image and thought it was Saturn, you are not alone. That would be a reasonable guess, given the impressive rings of the planet in the image. But this is Uranus, one of the less studied planets in our solar system. With this impressive image from JWST, the faint rings and atmospheric storms of Uranus have come to life in stunning, never-before-seen detail.
First imaged up close in visible wavelengths by Voyager 2 in the 1980s, Uranus looked like a calm, deep blue ball. At infrared wavelengths, JWST revealed a strange and dynamic ice world full of exciting atmospheric features.
Uranus could also serve as a precursor for the study of the nearly 2,000 similarly sized exoplanets discovered in the last few decades. This “exoplanet in our backyard” could help astronomers understand how planets of this size form and what their meteorology is like. This, in turn, could help us understand our own solar system as a whole, placing it in a wider context.
Io
This image, captured by NASA’s Juno spacecraft, represents the highest resolution ever achieved of the most volcanically active body in our solar system. During its 55th orbit around Jupiter, Juno ventured within a mere 11,680 kilometres of Io’s rugged surface, capturing numerous detailed images. The highlighted picture, with enhanced contrast and colours for clarity, unveils fresh insights into Io’s northern polar region, adorned with mountains towering up to 6,000 meters.
Despite being only slightly larger than Earth’s moon, Io is thought to be covered in over 400 active volcanoes, earning it the distinction of being the solar system’s most geologically active object. The vibrant hues decorating Io’s surface stem from the lava flows emanating from these volcanic vents. Juno’s upcoming encounters in 2024 promise even closer scrutiny of this enigmatic moon’s ever-evolving geology, offering further revelations about its dynamic nature.
Asteroid Dinkinesh and its moons
As NASA’s Lucy spacecraft journeyed toward Jupiter’s Trojan asteroids, it encountered its first destination, Dinkinesh, a small member of the main asteroid belt beyond Mars.
On November 1, 2023, Lucy flew past Dinkinesh and made a remarkable discovery: the presence of a small asteroid satellite in orbit around it. Subsequent imaging revealed an even more astonishing find: a pair of binary satellites, so close that they appear to be touching each other. This marks the first time such a pair, known as a contact binary, has been observed orbiting an asteroid.
Situated 480 million kilometres (300 million miles) from Earth and named after the Ethiopian moniker for the famous fossil “Lucy,” this equally intriguing contact binary satellite of Dinkinesh, measuring only 790 meters long, was dubbed “Selam,” after another fossil discovered in the region. Both satellites are approximately 220 meters in length. Researchers, who had never envisioned encountering such a system, continue their investigations and speculations in awe and wonder.
Crab Nebula
Released on October 30th, this image unveils new intricacies within the enigmatic supernova remnant famously known as the Crab Nebula. Left behind by a colossal star’s explosion in 1054, the Crab Nebula comprises expanding gas encircling a swiftly rotating neutron star at its core. In the image captured by JWST, the red-orange filaments of capillary gas are depicted with unprecedented clarity for the first time. Within the nebula, the reflection of light from dust grains illuminates in hues of yellow-white and green.
However, the revelations offered by this image regarding the inner workings of the Crab Nebula could be revolutionary. According to NASA scientists, there is a blue-white smoky glow around the magnetic field lines produced by the central neutron star, caused by charged particles travelling at nearly the speed of light. This luminous effect, termed synchrotron radiation, is just one of the ground-breaking discoveries that sets JWST apart from Hubble.
The 6.5-metre mirror of JWST boasts six times the collecting power of Hubble’s 2.4-metre mirror, yet it is JWST’s capability to observe in the infrared spectrum that unveils these extraordinary details. For comparison, here is a side-by-side depiction of the Crab Nebula captured by Hubble:
The big question mark
James Webb stumbled upon a cosmic curiosity while exploring the depths of space! Joke aside, the enigmatic object shaped like a question mark that JWST inadvertently captured leaves experts puzzled about its precise identity, although its colour and shape offer intriguing clues.
Speculations suggest it could be a distant galaxy or perhaps a pair of interacting galaxies. Gravitational interactions between merging galaxies can produce such peculiar formations. Certainly, the researchers weren’t aiming to photograph a question mark when this image was recorded. Zooming out, we’re treated to a captivating vista showcasing the fascinating and remarkably beautiful environs of two actively forming young stars.
Deep within the nebulous clouds, at the heart of the crimson radiation lines, these stars, dubbed Herbig-Haro 46/47, thrive by accreting gas and dust from the surrounding disk. Though the disk itself remains invisible, its silhouette is discernible in the form of two dark cone-shaped regions flanking the stars. The predominant pink-orange structures in the image represent the material expelled into space by young stars as they mature over thousands of years.
Flaming hair of the Sun
The Sun has never been seen quite like this before. This intricately detailed image of our star captures the aftermath of a record-breaking solar storm that recently surged through the Sun’s atmosphere. Dubbed “The Fusion of Helios,” this stunning image is the fruit of five days of meticulous collaboration between astrophotographers Jason Guenzel and Andrew McCarthy, who continuously seek innovative ways to portray the wonders of the cosmos.
This colossal flare reached heights of approximately 178,000 kilometres above the Sun’s surface, nearly 14 times the diameter of Earth. The captivating phenomenon persisted for up to three days before transforming into a plasma cloud expelled into space.
Moreover, a newly commissioned solar telescope in Hawaii has unveiled a series of photographs offering a close-up glimpse into the intricate landscapes of sunspots and tranquil regions on the Sun’s surface. This observatory in Hawaii was specifically designed to capture high-resolution images of the Sun and analyse the magnetic fields of solar phenomena that impact “space weather,” such as sunspots, flares, and coronal mass ejections (plasma eruptions from the Sun’s atmosphere into space). These occurrences can have profound consequences, disrupting power grids and telecommunication systems on Earth.
The hunter: Orion Nebula
The Hunter Nebula, a celestial favourite among astronomy enthusiasts, resides approximately 1,350 light-years from Earth and shines as the central “star” in the sword of the Orion constellation. This diffuse nebula, an expansive cloud of gas, serves as a vast stellar nursery nurturing young stars and potentially providing the material from which their planets may form. A recent image from JWST, focusing on a section of the nebular region known as the Orion Bar, illustrates how interactions between nebular gas and the energy emitted by newly born stars can yield the building blocks for life. The ultraviolet radiation emitted by these youthful stars enhances chemical transformations within the gases in this region.
Within this area, JWST has made a ground breaking discovery: the detection of an essential carbon molecule, methyl cation (CH3+), for the first time. Astronomers found this molecule concealed within the Hunter Nebula. Scientists speculate that CH3+, with its capacity to catalyse specific chemical reactions, could play a pivotal role in the organic chemistry of the cosmos and the genesis of life. Prior to JWST’s observations, there was no evidence of this molecule’s existence beyond our solar system.
Jupiter
The James Webb Space Telescope, primarily focused on exploring deep space, occasionally treats us to stunning glimpses of objects within our own Solar System in intricate infrared detail. These two captivating images, unveiled last year, were captured by the observatory’s Near Infrared Camera (NIRCam). Equipped with three specialised infrared filters, this camera unveils previously unseen facets of Jupiter. Since infrared light lies beyond the visible spectrum, the images underwent post-processing and were mapped to visible colours for our perception.
In the individual image of Jupiter, auroras stretch to the lofty altitudes of both the north and south poles of the planet. These auroras are depicted in a filter mapped to reddish hues, which also accentuates reflected light from lower clouds and upper mists. Another filter, mapped to yellows and greens, reveals swirling mists at the poles. A third filter, mapped to blue, exposes light reflected from the deeper layers of the main cloud.
In the wide-field image, Webb presents Jupiter’s lesser-known rings, which are millions of times paler than the planet’s own luminosity. Additionally, we see two diminutive moons, Amalthea and Adrastea. The faint, indistinct dots scattered across the background likely represent distant galaxies that share the frame with Jupiter.
In these images, the Great Red Spot, a tempest several times the size of Earth, and other clouds appear white due to their significant reflection of sunlight.
REFERENCES
- 1. https://www.nasa.gov/missions/webb/nasas-webb-rings-in-holidays-with-ringed-planet-uranus/#section-1
- 2. https://www.nasa.gov/missions/juno/nasas-juno-to-get-close-look-at-jupiters-volcanic-moon-io-on-dec-30/
- 3. https://www.space.com/lucy-dinkinesh-asteroid-satellite-name
- 4. https://www.nasa.gov/missions/webb/the-crab-nebula-seen-in-new-light-by-nasas-webb/?utm_source=TWITTER&utm_medium=NASAWebb&utm_campaign=NASASocial&linkId=244916778
- 5. https://www.nasa.gov/universe/webb-snaps-highly-detailed-infrared-image-of-actively-forming-stars/
- 6. https://www.nasa.gov/universe/webb-snaps-highly-detailed-infrared-image-of-actively-forming-stars/
- 7. https://mashable.com/article/sun-images-real-solar-telescope
- 8. https://www.newscientist.com/article/mg25734330-800-dazzlingly-detailed-photo-of-a-record-solar-tornado-14-earths-tall/
- 9. https://www.esa.int/Science_Exploration/Space_Science/Webb/Webb_makes_first_detection_of_crucial_carbon_molecule_in_a_planet-forming_disc
- 10. https://blogs.nasa.gov/webb/2022/08/22/webbs-jupiter-images-showcase-auroras-hazes/