Kanishka NaikA supernova remnant (SNR) is the structure remaining after a star explodes as a supernova. It consists of ejected stellar material and an expanding shock wave that sweeps up and heats surrounding interstellar gas.
Khurram Wadee ✅#SupernovaRemnant #CassiopeiaA
#Astronomy #Picture of the Day
Unofficial PetaPixel BotNASA’s 25-Year Timelapse Shows How a Supernova Remnant Grows https://petapixel.com/2026/01/07/nasas-25-year-timelapse-shows-how-a-supernova-remnant-grows/ #chandraxrayobservatory #supernovaremnant #astronomy #supernova #timelapse #chandra #science #Space #space #News #NASA #xray
#Simeis147: The #SpaghettiNebula #SupernovaRemnant
#Astronomy #Picture of the Day
Daniel FischerChlorine and potassium enrichment in the Cassiopeia A #SupernovaRemnant: https://www.nature.com/articles/s41550-025-02714-4 -> Where the elements come from: https://www.eurekalert.org/news-releases/1107792
Chlorine and potassium enrichment in the Cassiopeia A supernova remnant - Nature Astronomy
XRISM observations show the presence of odd-numbered elements chlorine and potassium in Cas A. These findings suggest that stellar activity plays an important role in cosmic chemical evolution, enriching space with elements vital for planets and life.
StellarSnap📸 Supernova Remnant Simeis 147
Simeis 147, also called the Spaghetti Nebula, is a vast supernova remnant 3,000 light-years away in Taurus and Auriga. Glowing hydrogen and oxygen filaments stretch across a region six times the width of the full Moon. A pulsar marks the collapsed core of the original star.
📅 January 13, 2022
📷 Jason Dain
🔗 stellarsnap.space
#APOD #Simeis147 #SpaghettiNebula #SupernovaRemnant #Pulsar #DeepSky #StellarSnap
Simeis 147, also called the Spaghetti Nebula, is a vast supernova remnant 3,000 light-years away in Taurus and Auriga. Glowing hydrogen and oxygen filaments stretch across a region six times the width of the full Moon. A pulsar marks the collapsed core of the original star.
📅 January 13, 2022
📷 Jason Dain
🔗 stellarsnap.space
#APOD #Simeis147 #SpaghettiNebula #SupernovaRemnant #Pulsar #DeepSky #StellarSnap
📸 Veil Nebula: Wisps of an Ancient Supernova
About 7,000 years ago, a star exploded in the Milky Way, creating the Veil Nebula. Once as bright as a crescent Moon, it now appears as delicate filaments of gas in the constellation Cygnus. This image from Kuwait in 2024 shows hydrogen in red and oxygen in blue.
📷 Abdullah Alharbi / NASA APOD
#VeilNebula #SupernovaRemnant #APOD #CygnusLoop #Astrophotography #Space #StellarSnap
About 7,000 years ago, a star exploded in the Milky Way, creating the Veil Nebula. Once as bright as a crescent Moon, it now appears as delicate filaments of gas in the constellation Cygnus. This image from Kuwait in 2024 shows hydrogen in red and oxygen in blue.
📷 Abdullah Alharbi / NASA APOD
#VeilNebula #SupernovaRemnant #APOD #CygnusLoop #Astrophotography #Space #StellarSnap
#VeilNebula: Wisps of an Ancient #Supernova
#Astronomy #Picture of the Day
NewsTainmentOraAstronomers discovered Teleios, a supernova remnant with perfect symmetry
https://newstainmentora.blogspot.com/2025/05/astronomers-discovered-teleios.html
#astronomers #teleios #supernovaremnant
https://newstainmentora.blogspot.com/2025/05/astronomers-discovered-teleios.html
#astronomers #teleios #supernovaremnant
Teleios (G305.4-2.2) -- the mystery of a perfectly shaped new Galactic supernova remnant: https://arxiv.org/abs/2505.04041 -> Observations detect a perfectly shaped #SupernovaRemnant: https://phys.org/news/2025-05-supernova-remnant.html
Teleios (G305.4-2.2) -- the mystery of a perfectly shaped new Galactic supernova remnant
We present the serendipitous radio-continuum discovery of a likely Galactic supernova remnant (SNR) G305.4-2.2. This object displays a remarkable circular symmetry in shape, making it one of the most circular Galactic SNRs known. Nicknamed Teleios due to its symmetry, it was detected in the new Australian Square Kilometre Array Pathfinder (ASKAP) Evolutionary Map of the Universe (EMU) radio-continuum images with an angular size of 1320"x1260" and PA = 0 deg. While there is a hint of possible H$α$ and gamma-ray emission, Teleios is exclusively seen at radio-continuum frequencies. Interestingly, Teleios is not only almost perfectly symmetric, but it also has one of the lowest surface brightnesses discovered among Galactic SNRs and a steep spectral index of $α=-0.6\pm 0.3$. Our estimates from HI studies and the Sigma-D relation place Teleios as a type Ia SNR at a distance of either ~2.2 kpc of ~7.7 kpc. This indicates two possible scenarios, either a young (under 1000 yr) or an older SNR (over 10000 yr). With a corresponding diameter of 14/48 pc, our evolutionary studies place Teleios at the either early or late Sedov phase, depending on the distance estimate. However, our modelling also predicts X-ray emission, which we do not see in the present generation of eROSITA images. We also explored a type Iax explosion scenario that points to a much closer distance of <1 kpc and Teleios size of only ~3.3 pc, which would be similar to the only known type Iax remnant SN1181. Unfortunately, all examined scenarios have their challenges, and no definitive supernova (SN) origin type can be established at this stage. Teleios's symmetrical shape suggests expansion into a rarefied and isotropic ambient medium. The low radio surface brightness and the lack of pronounced polarisation can be explained by a high level of ambient rotation measure (RM), with the largest RM being observed at centre.