Shop Mobile More Submit  Join Login

Journals: astronomy

367 results

The Journal Portal

Tune into the voice of the community by checking out DeviantArt's Journal Portal. Join the conversation by browsing, adding faves, and leaving comments, or submit your own Journal to let your voice be heard.

Submit Journal

58,166 Deviants Online

Galileo Galilei: The Starry Messenger

Fri Feb 13, 2015, 4:20 PM
Img-og by techgnotic

February 15 marks Galileo’s 461st birthday.

The man has a long list of accomplishments in the field of astronomy attributed to his name, including improving and developing the telescope, discovering sunspots, and proving that earth was not the center of the universe.

One of Galileo’s most widely-known accomplishments is the discovery of Jupiter’s four largest moons, also known, aptly, as the Galilean Moons. Their names—Ganymede, Io, Callisto, Europa—are widely known, but the consequences of their discovery are more significant than you might think. Because Galileo was an early developer of the telescope at a time when the science of astronomy was experiencing radical progress, he sometimes had the luxury of pointing his spyglass skyward and stumbling on a previously undiscovered object. To wit, the astronomer actually observed Neptune in 1612 and marked it in his notes as an insignificant, dim star. And while you can imagine Galileo’s initial discovery of these moons as being similarly haphazard, he quickly realized something significant had happened.

Upon his first observation, three of the Galilean Moons were arranged in a straight line extending outward from Jupiter.

Not altogether unremarkable in a sky full of bright objects, but it was the first indication that there was something unique about these spots. “Three fixed stars, totally invisible by their smallness,” Galileo remarked in his initial notes. After observing these objects on subsequent nights, he realized that their positions were changing relative to Jupiter, in ways that did not make sense for "fixed stars.” Within days, he realized that the three spots he initially observed were orbiting Jupiter, and that there was indeed a fourth object moving in conjunction with the others.

It’s an interesting enough discovery, but it was also inevitable. In fact, another astronomer, Simon Marius, working independently of Galileo around the same time, also discovered these moons and gave them the names we know them by today (Galileo had initially named them “The Medicean Stars” in honor of his patron-to-be).

The reason that this discovery really altered the course of astronomy is twofold.

The first is that it disproved once and for all old Aristotelian notions about the cosmos. Aristotle believed that every object in the night sky orbited around the earth, and Jupiter’s moons were the first objects to be observed not following this pattern of behavior. The second reason is that it would set Galileo down a path toward acceptance of the heliocentric model of the universe (i.e., the Sun being the center of the universe), which famously led to him being tried and found guilty of heresy, besides influencing a great deal of his later work.

These dual pillars of significance are actually parts of the same idea on a deeper level. Old notions about the universe (including geocentricism) emphasized the importance of the earth, and led people to believe that they were at the center of the universe. The fact that Jupiter had a few moons rotating around it did not directly contradict the geocentric model, but it laid a framework for a more holistic way of thinking about the cosmos. That is, it exposed the scale of our universe as being something much larger and more complicated than our own planet or even our own solar system. Carl Sagan famously pointed to a photo of the earth sent back from the Voyager 1 in which the earth appears no larger than a pixel. He described our planet as a “pale blue dot,” the significance of which, if any, was dubious. Galileo opened the door to this line of thinking, and allowed us to begin seeing the universe as something bigger and more mysterious than just our corner of the neighborhood.

Your Thoughts

  1. Galileo avoided being burned at the stake (for claiming the Earth orbited the Sun) by recanting his scientific observations and spending the last nine years of his life under house arrest. Have we greatly advanced in our debating skills over the past 400 years, or is violence still too prevalent as a form of “dissenting opinion?”
  2. Humanity once thought the universe was only what could be seen in the night sky. Does the vastness of the universe we know today make you feel we are insignificant? Or does it fill you with wonder over what miracles and possibly what other life forms may be out there in that vastness?
  3. Do you welcome announcements of new scientific discoveries and get excited at the prospect of new discoveries always bringing a clearer picture of reality into focus? Or do you fear new science will ruin comfortable traditional ways of thinking?

E A R T H - S C R I P T U R E S

Wed Sep 18, 2013, 3:51 AM


Thu Oct 9, 2014, 10:00 PM by Urus-28:iconurus-28:

Science related Art Week

A Brief History

From the beginning of civilization, the study of the sky has been a constant theme. Some scientists even claim that the prehistoric paintings of the Lascaux Cave are in fact depictions of constellations. True or not, astronomy is definitely one of the oldest sciences, if not the oldest.
For centuries, maps of the sky and the universe were created, most of them with a religious idea in mind.
Aside from the spiritual aspect of astronomy in the Occident, stars are also used for sea navigation. The Arab civilisation is at the origin of many star names and precise measurements of star positions.

Picture via wikipedia :…

At the renaissance astronomy was progressively separated from astrology and religion (not without difficulties). The invention of the telescope was critical to some of the most important discoveries of the renaissance.
With the invention of the telescope, the sky became even more impressive, and with the development of science and technology telescopes are becoming larger and larger.
The most famous telescope is probably Hubble. We are all familiar with incredible pictures like the pillar of creation.

Pictures via

But do you know where the colours come from, and if they are the real colours of the sky ?

The Hubble Pallette

If you thought that the beautiful colours from Hubble pictures are real, I'm sorry to destroy your dreams, but they are in fact false colours. Astronomers use the light to analyse the composition of stars and nebulae, and extract specific light rays showing the presence of a particular elements. These pictures are called narrowband images. By affecting these narrowband images at specific RGB channels, they can create the colour they want.
Here is an example of a Hydrogen Oxygen Nitrogen false colour picture.

  Red = Hydrogen                  Green = Oxygen                        Blue = Nitrogen

Resulting HON picture

Pictures via : Almaden Observatory
The choice of colour can be decided by a scientific use : the picture has a visual composition information, but it is also the result of a personal choice and picture beauty. Hubble astronomers are also artists in their job.
If you want to create your own images using this technique, a software is available as a plug-in for photoshop.…

The Night Sky

No need to have the budget of NASA to make pictures of space. A simple camera can create very impressive pictures of our galaxy and an amateur telescope can show nebulae in their full glory.

Space Travel Star Trail by CapturingTheNight The Flaming Star Nebula IC 405 by Captain-Marmote
Great Orion Nebula, winter 2011 by whiteLion07
Possidonius Hercule and Atlas by frenchbear The Great Christmas Comet of 2011 by CapturingTheNight Castor and Pollux with MW by Arafinwearcamenel


How to make picture of the milky way ?
Fixed Tripod Astrophotography And The 600 Rule by CapturingTheNight Milky way tutorial for light polluted areas by Draken413o Milkyway Tutorial 2 by Draken413o

Space Art - The Intersection

Space art is somewhere in between science and science fiction. It is often used to illustration science articles. Space art is at present time the only way we have to visit our universe.

Hells Gate by thaOman Insomnia by Vyter
Nova One by Hameed Marbellised Maelstrom by priteeboy
Lateralis by JoeyJazz Brutus by goodforn0thing

Astronomy Photographer of the Year 2013

Journal Entry: Wed Jul 17, 2013, 5:23 AM

Aurora Brutality has just gotten on the shortlist of the Astronomy Photographer of the year 2013 competition, which means that I will get an invite to the exibition at Royal Observatory Greenwich in London where the winner of each category will be revealed and finally theoverall winner which can crown themself with the coveted title.

This image is on the shortlist in the category "Earth and space", so it has to go through there and be the overall winner to take everything home.

Personally I am very honored to be on the shortlist with such caliber of photographers, and it also fuels the fire to continue to try achieve as good results as I
possibly can with the camera.

Wish me luck, and have a superb day. :bow: :boogie:

Aurora Brutality by Trichardsen

Photography only :)

Nebulae: ( Latin "nebula" - "little cloud" )

The Great Orion Nebula by octane2The Constellation of Scorpius by octane2The Tarantula Nebula - Mk II by octane2The Alnitak Region in Orion by octane2Antares in Scorpius - Mk II by octane2The Eta Carinae Nebula by octane2The Witch Head Nebula by octane2The Large Magellanic Cloud by octane2The Constellation of Orion by octane2The Christmas Tree Cluster by octane2Orion Nebula Complex by DoomWillFindYouOrion Nebula by astrnmrM8 and M20 Widefield by astrnmr:thumb83572103:

Galaxies: ( Greek " γαλαξίας " ( galaksias ) - “Milky Way” )

M-51 Whirpool Galaxy by MilchstrabeSTernNGC 5054 Spiral Galaxy by MilchstrabeSTernAndromeda Galaxy - M31 by Hector42Triangulum Galaxy by DoomWillFindYouNGC 5054 Spiral Galaxy by MilchstrabeSTernAndromeda Galaxy by photon-hunterSculptor Galaxy by DoomWillFindYougalaxy by poseidonsimons-sAndromeda by DoomWillFindYou:thumb133851343:M82 Cigar Galaxy by Alfil


Mars by frenchbearJupiter by kironohasamaMoon Eclipse by ZeSlyJet and Venus on the sun by woodycxdThe Occultation of Venus 2 by Experiment720Saturn 26.1.07 by quicksimonHurricane on Neptune by EnchantedChaosTransit of Mercury 2006 by aravii


McNaught's Comet by TomMontgomeryHale Bopp comet by ian-atkinson:thumb105929996:Make a wish by Guido101



I am honored to have 2 of my images shortlisted for Astronomy photographer of the year 2014.

What the ....!
What The ....! by Trichardsen


Arctic night
Arctic Night by Trichardsen

One can be seen in this article

Winning images will be decided in September at the Royal Observatory in greenwich, wish me luck. :)

Ok, so, i went town with my friend and went into this shop and whilst she bought some stuff i found a small book on Astronomy. I've always been interested in it and i love camping and sitting out under the stars. Me and a friend usually sit outside at night, when camping, and watch the sky, waiting for something to happen. well one night something did, we where sitter there, and just starring up at the night sky, just chatting about how amazing it is and how small we felt, then this realy bright shootin star shot right across the sky. it was visible long enough for us to sit up and gasp at the exact same time XD, we sat there, starrin in absalute unbelief untill somthing in us finally snapped and we just looked at each other and jumped up and ran to my caravan, where the perents where, and ran to my friends dad (hid dad knows quite a bit about stars and stuff) and startin ranting on about it, i dont think any one could understand us :D Any hoo, i was so amazing.

So, ever since i got this book, i cant seem to put it down and i cant seem to stop thinking about it. I realy realy realy want to see a comet and a meteor shower and the book tells me when they occur. last time there was a metoer shower (or last time i remeber one happening) was last year and i was in the most perfect place to watch it, far from lights in the middle of a field, the people who owbed the caravan site had turned all the lights off so that and everyone else could watch it...but alas...i fell asleep, completely oblivious it was happening untill the next day when people told us. ARRRRRG, i was (and sill am) so pissed off i missed it. i also missed a lunar eclips that i could of seen from my flippin bedroom window. DAM YOU SCHOOL!. if i had one wish right now, it would be to go into space, maybe visit the ISS (international space station) and go to the moon. I dream of being able see to earth from the moon, lookin at my home planet as if IT was the moon :icondreamplz: i also want a telescope, (i wonder if my perents would let me buy one?)

of and ps. if you have had any experienses like comets, eclipses, shooting stars ect, please feel free to shar them ^^ or just anything spacy you wanna share :hug:
  • Listening to: The Year turns round again
  • Reading: Astro boy fanfics or Astronomy book
  • Watching: Astro boy or Space stuff on youtube
  • Playing: Sonic Games
  • Eating: Tangarines
  • Drinking: Milky Coffee
50 Amazing and strange Astronomy facts:
1-Saturn would float if you would put it in water.
2-If you would place a pinhead sized piece of the Sun on the Earth you would die from standing within 145 km (90 miles) from it.
3-Space is not a complete vacuum, there are about 3 atoms per cubic meter of space.
4-Only 5% of the universe is made up of normal matter, 25% is dark matter and 70% is dark energy.
5-Neutron stars are so dense that a teaspoon of them would be equal to the weight of the entire Earth’s population.
6-The Sun is 400 times larger than the Moon but is 400 times further away from Earth making them appear the same size.
7-The star Lucy in the constellation Centaurus is a huge cosmic diamond of 10 billion trillion trillion carats.
8-Seasons last 21 years on Uranus while each pole has 42 years of sunlight followed by 42 years of darkness.
9-Venus,on the other hand, does not have any seasons at all.
10-1 year on Mercury consists of less than 2 days on Mercury.
11-There are as many oxygen atoms in a breath as breaths of air in the atmosphere.
12-Helium is the only substance in the universe that cannot be in solid form.It can’t be cold enough.
13-The coldest place in the universe is on Earth. In Wolfgang Ketterles lab in Massachusetts. 0.000000000001 degrees Kelvin.
14-The pistol star is the most luminous star known 10 million times the brightness of the Sun.
15-Saturn’s moon Titan has liquid oceans of natural gas.
16-All the planets are the same age: 4.544 billion years.
17-Earths moon was most likely formed after an early planet named Theia crashed into Earth.
18-8000 stars are visible with naked eye from Earth. 4000 in each hemisphere, 2000 at daylight and 2000 at night.
19-90-99% of all normal matter in the universe is hydrogen.
20-Only 55% of all Americans knows that the Sun is a star.
21-Because of the speed the Sun moves at, solar eclipses can last at most 7 minutes and 58 seconds.
22-Lunar eclipses, however, can last 1 hour and 40 minutes.
23-All the coal, oil, gas, wood and fuel on Earth would only keep the Sun burning for few days.
24-A full moon is nine times brighter than a half moon.
25-When the Moon is directly above your head or if you stand at the equator, you weight slightly less.
26-A single Quasar produce the same amount of energy as 1 trillion suns.
27-Just after the Big Bang, everything in the universe was in liquid form.
28-A planet nicknamed “The Genesis Planet” has been found to be 12.7 billion years old making it the oldest planet found.
29-The shape of the universe looks a lot like a brain cell.
30-Every year, the Moon is moving away from Earth by 3.8 centimeters.
31-The Moon spins around its axis in the same time it goes one lap around the Earth which makes us always see the same side of it.
32-Upsilon Andromeda B also only face one side to its star. One side is hot as lava while the other one is cold below freezing.
33-The average galaxy contains “only” 40 billion stars.
34-While in space astronomers can get taller, but at the same time their hearts can get smaller.
35-Mars surface is cowered with iron oxide (rust).
36-Only half a billionth of the energy released by the Sun reaches Earth.
37-Rogue planets are not bound by any star, brown dwarf or another planet which makes them free-float around the galaxy.
38-Sweeps 10 is the planet with the shortest orbital period found. It orbits its star in only 10 hours.
39-85% of all stars in our galaxy are part of multiple-star systems.
40-Some brown dwarfs have liquid iron rain falling down on them.
41-The light emitting from the Sun is actually 30.000 years old.
42-Of the over 20 million meteors that are observable every day only one or two reach the surface of Earth.
43-The United States have approximately 3.500 astronomers, but over 15.000 astrologers.
44-The closest black hole to Earth is only 1.600 light-years away.
45-There are at least 10^24 stars in the universe.
46-Certain “star quakes” have been found to tear apart the surface of neutron stars.
47-Any free-moving liquid in outer space will form itself into a sphere due to surface tension.
48-The odds of being killed by falling space debris is 1 in 5 billion.
49-Neutron stars can rotate up to 500 times in 1 second.
50-The largest structure found in the universe is the Sloan Great Wall, a super cluster of galaxies 1.37 billion light-years wide.

Number 20 is quiet alarming, that's why I italicized and underlined it. Although, it's not surprising because most people see stars as those tiny points of light that we see in the night sky, rather than the big hot balls of plasma that gives off light and heat :/

The Astronomy Photographer of the Year competition kicks off its annual global search for the best and most spectacular visions of the cosmos, whether they are striking pictures of distant nebulae or dramatic images of the night sky.

I've been finding myself obsessed with what's above us... No, not religion, but space. Stars, Galaxies, the Universe, Nebulas, Solar Systems, Worlds, did I mention Stars?, everything that's beyond our atmosphere. Man I don't know what the hell is my problem but I just cannot stop searching for that stuff in the internet, Wiki and YouTube. I've always wanted a telescope to search the sky at night, observe the moon and whatnot, but I have no moneys for that kind of expense.
I think I have found out that UY Scuti is the most massive star in the Universe (possibly, with roughly a diameter of 2,375,828,000 kilometers it has a surface area of about 2.91 million times that of the Sun) and man, those huge stars and massive spaces out there just blow my mind, majorly. Nebulas, also beautiful to sight, amaze me. To think that 1 light year of distance is 6 trillion miles, and many things out there are more than just 1 digit-of-light-year away, man... It just explodes in my mind, I don't know how to explain. And many other things really catch my attention.
I've been feeling these funny thoughts a long time ago when I watched Star Wars, played Mass Effect and that similar stuff, but I have not felt such a liking to it until a couple of months ago, possibly at the beginning of November. Ever since I've found myself looking at these stuff much more.
The thought of all of this also expands my imagination, it is impossible for us to be the only living, intelligent creatures, certainly improbable. There may be other humans in different parts of the Universe, who's to say that I am wrong?
Or maybe other kind of intelligent beings, as many movies, stories and games have shown us, yes.
Who's to say that intelligent living dragons do not exist either? Like the ones you and I created? That is why I recently decided to locate Ysulyan's World inside a Solar System within the Milky Way, making it definite (before this I didn't even know where to put it).
And what about different resources we lack on Earth but we can find in massive amounts somewhere else? If we run out of resources here we can simply explore the infinity that is our Galaxy already, and there are millions of other Galaxies out there, although extremely far away-- If we ever make it to create space ships capable of transporting us to such distances...
Some say it is not possible to travel at the Speed of Light because the Theory of Relativity explains that traveling at such speed would actually return you in time (True? I don't think so).
If anyone shares this affinity towards Astronomy please try to share some stuff with me, because even though I'm apparently interested in this subject, I know very little xD
  • Mood: Mesmerized
  • Listening to: Jack Johnson