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Photo of the Pleiades (Messier 45) I took to test my new telescope. This is an open cluster of stars situated about 440 light years from earth, the brighter stars of the cluster are visible with the naked eye (around 5 to 10 stars visible depending of the light pollution, weather and eye accommodation do darkness). Unfortunately, the nebulosity, which I composed of dust clouds reflecting the light from the bright stars, is only visible in photos or with (relatively) large telescope. The cluster is about 100 million years old which is young (for an astronomical object), the more visible stars are hot blue giants, but many other, less visible, stars are present in the cluster. This cluster due to its high visibility has taken an important place in many cultures and mythologies.

(as a fun fact the name of M45 in Japanese is Subaru, and yes the car brand dose gets its name for this star cluster (which explains the logo of the brand))

There might not be sound in space, but there is quite a lot to listen to in the radio frequencies (especially when it comes to the planets of the solar system).

(the full article : https://www.jpl.nasa.gov/news/nasas-juno-spacecraft-enters-jupiters-magnetic-field ) Some ''similar'' sounds are also present on earth with for example the reverberation if radio waves emitted by lightning.

I'm trying to find a clean, concise, factual video of pulsar pulses but the top results on youtube are all fake clickbait bullshit. Where are the videos from professor so-and-so with 10 subscribers of simple black and white graphs.

(this page has what I'm looking for but afaik none of these videos are on youtube)

Photo of NGC 7000 / the North American nebula (southern part), the bright star on the top left corner is ξ Cygni. Might rework it later since this one still has a bit too much gradient/haze due to the full moon when I took the photos. In most cases, emission nebula are the result of gas clouds being ionised by the high energy UV radiation coming from very Hot (and often massive) stars/star cluster. In the case of NGC 7000 the star(s) responsible for most of the ionisation was an unknown for quite a long time, it is only in 2004 that the star responsible for the ionisation was located. This star (actually a binary system according to later publication) known as J205551.3+435225 is located behind the dark region of the nebula (bottom right corner of the photo) which explains why it was only recently identified.

(My best guess of the position of J205551.3+435225 in my picture according to what I can find in the original publication and in the SIMBAD database)

One last thing, that star was later nicknamed Bajamar Star, which comes from the original Spanish name for the Bahamas island.

Picture of the bubble nebula and surrounding objects : Top left (the vague group of stars): M52 an open cluster

Center right: NGC 7538 an emission nebula (also known as the northern lagoon nebula)

Bottom center: NGC 7635/the bubble nebula and the surrounding hydrogen cloud

The ''bubble'' part of this nebula is created by the stellar wind (flow of gas, plasma and particle) emitted by the central star at nearly 650 million km/h hitting and compressing the surrounding interstellar gas. The central star (BD +602522) is currently estimated to be about 45 times heavier than our sun and about 4 million years old. Being so massive and thus very hot (it's a type O star) its lifespan is very limited for a star and it should go supernova in about 10 to 20 million years.

BD +602522 is slightly off center from the bubble, this is due to the interstellar gas being a bit more dense on one side and thus slowing the stellar wind more efficiently.

Single exposure to make the central star more visible.

Image taken using a CarbonStar 150/600 newtonian telescope with a 0.95 coma corrector, ZWO ASI294 monochrome camera. 12x300s image for each colour filter (LRGB) and 12x300s for the Ha filter, total imaging time 5h, stacking and processing done in PixInsight.

Starless version of the same image:

Older image where the bubble is more distinct from the background hydrogen clouds :

I took another photo of the crescent nebula (C27) this time using my monochrome camera and processed similarly to my photos of the veil nebula. The H-alpha photos really helped to enhance the ionised hydrogen present in this region of space (deep red clouds in the background). Still not completely satisfied with how the stars turned out (too much halo visible around them), could have been mitigated if the clouds had not come half way through the imaging session or if I do another night of imaging of this target.

Picture of IC59 and IC63. This is a pair of nebula located near the star γ Cassiopeia, the big star at the bottom, which is responsible for making the nebula glow. Both nebula are composed of ionise hydrogen responsible for the red colour (especially on IC63) and colder dust/gas responsible for the blue colour (most visible on IC59). γ Cassiopeia can make taking photos of those nebula difficult due to the halos it produces, I did my best to limit its impact during processing, but there is still a faint blue halo around it. IC63 is also known as the Ghost of Cassiopeia due to its shape, it was discovered in 1893 by the German astronomer Max Wolf.

Image taken using a CarbonStar 150/600 newtonian telescope with a 0.95 coma corrector, ZWO ASI294 monochrome camera. 12x300s image for each filter (LRGBHa), total imaging time 5h, stacking and processing done in PixInsight. Details of both objects: IC63

IC59

Photo of the NGC 2237, the Rosette nebula and the star cluster inside it, NGC 2244.

The star cluster, which is estimated to be about 5 million years old, is responsible for the ionisation of the surrounding gas. The mass of the nebula is estimated to be about 10 000 times the mass of our sun, which is relatively massive for a diffuse nebula.

This image uses a SHO palette, I quite like the colours I manage to get, both as the normal and starless images.

I also tried using the Foraxx palette, I think it's a bit less interesting visually, but the dark dust structures seam a bit more visible.

(Image taken using a CarbonStar 150/600 newtonian telescope with a 0.95 coma corrector, ZWO ASI294 monochrome camera ZWO LRGB filters and Baader 6.5nm SHO filter. 5x120s image for each colour filter (RGB), 15x300s for the Ha filter 20x300s for the SII filter and 18x300s for the OIII filter, total imaging time 4h 25min, stacking and processing done in PixInsight.)

Picture of M27, the Dumbbell nebula (aka the Apple Core Nebula), I took at the end of last month. This is a planetary nebula, it's the result of a star similar to our sun, that had turned into a red giant at the end of its life, ejecting its outer layer of gas and plasma into space. A planetary nebula is probably a relatively ''short'' phenomena, lasting around 10 000 years. Once the central star has ejected most of its hydrogen/helium and that the nuclear fusion in it has stopped, the nebula will start to cool down and disappear while the star turns into a white dwarf. Planetary nebula have an important role in redistributing some of the matter from dead/dying stars in the interstellar medium.

I personally think that photo is good, but some of the more faint external structures are barely visible, might take another picture of it and/or more photos to stack later in the month.

Photo a few galaxies, M81 / bode's galaxy (centre), M82/the cigar galaxy (left) and NGC 3077 (right)

In addition to those three galaxies, there are many other (much) smaller ones hidden among the stars (a few examples):

The red-ish filament visible around M82 are ionised hydrogen gas and dust pushed outwards by galactic-superwind

Those are tough to be a combination of solar winds created by young stars and the shockwaves of frequent supernovas. They mostly occur in starburst galaxy a type of galaxies that experience heightened stars formation generally due to recent gravitational interaction with other galaxies, in the case of M82 the trigger is most likely its neighbour M81.

(Image taken using a CarbonStar 150/600 newtonian telescope with a 0.95 coma corrector, ZWO ASI294 monochrome camera ZWO LRGB filters and Baader 6.5nm Ha filter. 12x180s image for each colour filter (RGB), 6x300s for the Ha filter, total imaging time 2h 54min, stacking and processing done in PixInsight.)

I've worked in a chemistry lab, they had a room with all the analysis and purification equipment. There was a constant noise due to the various pumps (vacuum, solvent, ...) and valves. After just a few days working there I could telle exactly with machin was doing what task and at what point it was in that process just based upon the noise they made.