Wallpapers: Images from other places and times
Below are some of my dabblings into the world science fiction themed art. Click on the previews for a full size image you can download for personal use. Comments and discussions are always welcome. (rcdavison@orbitalmaneuvers.com) Enjoy!
Interloper
An extraterrestrial civilization launches a pair of scientific probes to intercept an interstellar asteroid passing through their solar system.
Exoplanet Weather - Sunny with Scattered Showers
How many exoplanets, and potentially exomoons, have weather similar to what we experience day-to-day here on Earth? It’s fascinating to think that right now, somewhere out there in the cosmos, it’s raining or snowing or windy along the seashore or just sunny with scattered showers. Some day we may have the means to go see it in person!
Nexus Moon's Home Planet
Companion image to "Nexus - The Beginning" below. This image presents a view of the moon's home planet. The planet is covered with deserts and dunes, with a thin atmosphere and is devoid of life.
All it takes is some water, heat, the right elements and a whole lot of time...Primordial life makes its way out of a lake in an impact crater on an exoplanet's habitable moon.
Shades of Autumn
Meanwhile, back on Earth in the Northern Hemisphere.
Alignment
Water on a tidally stressed moon of a gas giant begins to vaporize as the planetary system’s aging star swells in its death throws.
Retirement Home
With the potential number of habitable exoplanets in the Milky Way Galaxy ranging from 300 million to 6 billion (That’s not counting moons that might be habitable, like Pandora in Avatar.) one might just find this planet. Getting there is another story!
Lander
"Seven minutes of terror" are magnified a hundred times as a lander lowers a rover to the surface of a cold icy moon with a methane atmosphere and geysers showering the way.
JUICE Flyby of Ganymede
The European Space Agency’s JUICE (JUpiter ICy moons Explorer) flies over Ganymede during its mission to explore Ganymede, Europa, Callisto and Jupiter. Set to launch in August, 2023 and arrive in the Jovian system in 2031.
Pulsar Embers
The ruins of a city on a circumbinary planet pays mute homage to the pulsar left in the wake of a supernova of one of the stars. The planet's atmosphere was stripped away in the cataclysm, and its surface is now bathed in X-rays from the young pulsar; one can only hope that it's inhabitants had the technology to escape in time.
Harvest Moon and Hallows' Eve
Meanwhile, back on Earth it's mid-autumn in the Northern Hemisphere and we celebrate the colors of fall in the setting evening sun with the Harvest Moon. The end of October brings Halloween and we thrill to the those things that lurk in the shadows and go bump in the night!
Space is Hard
A space crew finds out the hard way that space is hard as they crash-land on a habitable moon that orbits their home world, which is located in a trinary star system.
Ring of Fire
An aboriginal species gathers for the coming night under the light of a pair of colliding galaxies. How many centuries or millennia will pass before they can appreciate the cosmological dynamics at work in their night sky?
Woodland Stream:
Meanwhile, back on Earth...
Ganymede's Morning:
The sun rises over Jupiter and lights up the shadows in one of the many grooves that cut across the surface of the largest moon in our solar system.
Cassiopeia in 3D:
The constellation, Cassiopeia, is a simple constellation known for its asterism of five stars that looks like a "W" with a slight tilt on one side. Four of the five stars of Cassiopeia appear to be very close to the same brightness (Caph, Ruchbah, Schedar and Navi), with one of them slightly dimmer than the rest (Segin). This gives the impression that the stars are all about the same size and distance from Earth, but when we look at the constellation in a 3D projection we can see that they are not. The intrinsic brightness of Ruchbah, Schedar and Navi, (and almost for Segin) compensates for their distance from Earth in such a way that it gives the illusion that they are all at the same distance. See the blog post - Cassiopiea's Illusion for more about this.
Evening at the Beach:
Take a break, relax and spend an evening at the beach with someone special. With all the planets out there, it's hard to believe that someplace like this doesn't exist. (Companion piece to "Dinner for Two with a View".)
Above the Vortex:
We have a moon that lights up our night sky, imagine if we were in the halo of a spiral galaxy. Imagine the first travelers into space from the habitable moon that orbits this super-Earth and their amazement when they first viewed their position, suspended over the vortex of the spiral galaxy below.
Meanwhile, back on Earth:
Two autumn images to celebrate the colorful transition from summer to winter in the Northern Hemisphere:
Autumn Morning
A doe and her fawn greet the morning Sun on a cool autumn morning.
We see these amazing Hubble images of galaxies colliding and it got me wondering about seeing this in one's night sky. Unfortunately, our lifetimes are too minuscule to perceive the changes, but maybe, out there, somewhere, is a living organism whose lifetime extends for eons and it bears witness, as a lone sentinel, to the galactic collision silently unfolding.
Waterway
Sailing the seas and waterways of an exoplanet, sailors explore their world. In time they'll look to the stars and set out on a journey through celestial waterways of the cosmos.
Globular Cluster Rising
A globular cluster rises above the horizon of a wind-swept moon of a terrestrial-like planet. These dazzling clusters can contain from hundreds of thousands to millions of stars older than our sun. They are small, only 10 - 300 light-years across compared to our Milky Way Galaxy, which is about 100,000 light-years across.
Stellar Systems of Orion
The Orion constellation is one of the most distinctive constellations in the sky and is visible from both the Northern and Southern Hemispheres. Its outline is made up of some of the brightest blue-giant stars in the night sky with Rigel leading the group marking Orion's right leg. Betelgeuse, a red super-giant marks Orion's left shoulder. Orion has many other treasures and the stars we see, Rigel, Mintaka (the belt star on the right), Alnitak (the belt star on the left), are not just single stars but are made up of multiple stars orbiting each other. The image below shows these star system, plus an additional one, Sigma Orionis, which is below Alnitak. And, let's not forget about the Orion Nebula, a veritable star factory containing over 3000 stars! (Check out the blog post about these star systems.)
In a game of cosmic billiards a comet threads its way between a planet and one of its moons. We were not as lucky on June 30, 1908 when an asteroid exploded over Tunguska, Russia, leveling trees over 830 square miles (2,150 sq. km). International Asteroid day is celebrated on June 30th to bring attention to the threat asteroids pose to our world.
The top image shows a very active comet shrouded in a gaseous coma and generating a blue ion tail along with it's dust tail, while the image on the bottom shows a less active comet nucleus shedding dust, more akin to the comet 67P/Churyumov–Gerasimenko that ESA's Rosetta mission spent two years studying.
Terra Alternatus
I’m fascinated with the idea of convergent evolution, where different species can independently evolve the same features over different times or epochs. Extending this to habitable exoplanets makes me wonder if a land-bound species would develop the same technology to sail their seas that we developed on Earth. Is this development driven strictly by the laws of physics? I would expect that those species that gained a deeper understanding of math and the sciences would more rapidly develop the technology to travel to the stars after sailing their oceans. Just one more thing to ponder when you gaze up at the night sky...
In the Beginning
A rocky planet going through its early stages of evolution as observed from the vantage point of one of its moons, which is also going though the throes of early development. The moon, being smaller than the planet is cooling more quickly and has a thickening crust, which is fractured with numerous volcanoes and rifts.
Shipwreck
A habitable planet in a trinary star system whose inhabitants have felt the wrath of Mother Nature while sailing its seas. Too often we think of extraterrestrials as more advanced than we are, but we may find that is not the case as we venture out in the cosmos.
Ice and Water
Exoplanets are sounding more and more appealing with the current state of affairs on our planet Earth. Here's a nice one with some sun, some water, a little bit of ice (Maybe more than a little bit!) and even some fauna flying and swimming through its ecosystems. We just have to find it...and then find a way to get there!
Above the Clouds
Back out in the cosmos and cruising through the clouds with some local fauna of a habitable moon of a gas giant. Maybe one day humankind will see something like this firsthand.
Meanwhile, back on Earth in the Northern Hemisphere it is autumn:
Autumn Morning Colors
Blue Autumn
A Really Bad Day!
A rogue planet with its accompanying moon slamming into Earth is not something one wants to contemplate, but it's a possible, although not very probable. We have more to worry about from asteroids that are in our solar system or passing through. Some of these are small enough to miss detection, and they can come from any direction. And, they can be large enough to destroy a city...a very big city!
Appreciate all that we have today, as we do not know what tomorrow will bring!
Orion in 3D Revisited (Featured in Astronomy Picture of the Day)
Sail On
Dusty Mars from Phobos
Time to get off planet Earth and back into space!
A probe from Earth lands on Mars' largest moon, Phobos, just in time to see a dust storm envelop the red planet. Mars' smaller, more distant moon, Deimos, can be seen of in the distance on the left.
Sunset
Meanwhile, still back on Earth:
Sunrise Cove
Meanwhile back on Earth:
Frosty Moon
At the outer fringes of the habitable zone in a binary star system a snow-covered moon orbits a ringed planet. Despite the frozen environment the moon is teaming with life. The skiing is great! Swimming - not so much!
Orion in 3D
Orion the Hunter is one of the most recognizable constellations in the night sky, and one of its striking characteristics is the red super-giant star, Betelgeuse, that marks his left shoulder. This star is a variable star that changes in brightness over time, but as of the fall of 2019 it has been steadily dimming. As of February 2020 it has set a new record with its new luminosity and lower temperature. This may be a prelude to the star going supernova, but then again maybe not. Astronomers think that it could be a 100,000 years or more before that will happen. But, then again, there is a lot we don't know about the Cosmos and we are learning more each day. Maybe Betelgeuse will teach us a thing or two! (For more information on Orion and the 3D perspective in the illustration, check out the blog post: The Multidimensional Constellation, Orion.)
Volcanos
Volcanos, destroyers and builders of worlds. They can shape the geography of a planet with the lava they exude and influence its atmosphere by the gas, ash and other particulates they pump out. This image shows an exoplanet on the outskirts of a galaxy in the neighborhood of a globular cluster. A series of volcanic islands are forming due to plate tectonic, similar to the Hawaiian island chain in the Pacific. Thermal vents may exist in the depths of the oceans nurturing more advanced life...
Autumn Stream and Winter Stream Christmas Night
Two terrestrial images to enjoy and celebrate the beauty of our planet Earth:
Night Expedition
As of mid-September 2019 there were just over 4050 confirmed exoplanets. A small percentage of those are the right size, in the right orbit around their stars to have liquid water available and may potentially have environments that could harbor life as we know it. Extrapolating our small sample of stars and the planets that orbit them to the Milky Way Galaxy at large, there may be hundreds of billions of exoplanets out there, with billions in the habitable zones of stars. But it doesn't stop there, because if we consider that many of these planets may have moons, which may also have the right properties to support support life as we know it, the number of habitable celestial bodies could be in the hundreds of billions. What about life as we don't know it?
With all those planets out there we have a lot of exploring to do! In “Night Expedition” a group of future space explorers examine a newly discovered moon orbiting a ringed gas giant.
Exoplanet Sunset
Somewhere out there among the estimated 40 billion Earth-sized planets and potentially trillions of moons orbiting in habitable zones of stars, a local star is setting on distant shores of an exo-moon orbiting a gas giant in a binary system.
Sunny With Scattered Snow Showers
Some exoplanets will have weather just as we have on Earth. Some of those will have a dynamic biosphere filled with life reminiscent of our home world. With over 4000 exoplanets confirmed, as of July 2019, who knows what wonders await us!
Exomoon Annular Eclipse
An annular eclipse is where the foreground planet doesn’t fully block the disk of the star, leaving a ring of light visible around it. In the image there is a binary system consisting of a standard G-type yellow dwarf star similar to our sun and a red dwarf. The yellow dwarf has a planetary system which contains a habitable exomoon that orbits a gas giant at just the right distance so that it’s populace is treated to an eclipse with every orbit.
The Mars rover, Opportunity, spent 15 years traversing the surface of Mars, covering 28 miles (45 km) while looking for evidence of water. Eventually humans will walk the surface of the red planet and in time they will look for those intrepid machines that preceded them. “Opportunity Found” depicts a Martian evening and the first time human eyes directly behold the rover since it left Earth.
Winter Eclipse
The Moon rising fully immersed in the Earth's shadow during a total eclipse.
End game: Twin gravity tractors shepherd a rogue asteroid that was on a collision course with Earth. The asteroid did not present a global threat per se, but it is large enough to destroy a large city such as New York, London or Moscow.
The gravity tractors will exert a steady gravitational pull on the asteroid, shifting its trajectory and given adequate time, the asteroid can be deflected enough to miss the Earth. Either of the tractors by itself could deflect the asteroid, but two were sent in the event that if one were to fail, the mission could still be completed. Planetary defense using gravity tractors will only be successful if we find the asteroid threat early enough.
Lunar Christmas 2018
A cold, clear winter night with a comet and meteor accompanying the full moon in lighting up the forest at night.
Earth is not the only planet in our solar system that is illuminated by auroras, the gas giants and ice giants in the outer solar system also have auroral displays. Even Mars and Venus have auroras, although driven by a different process. So if we have them, then they must also be found throughout the cosmos and 'Aurora on Exoplanet #9' is one imagining of such a planet.
Autumn Pond
It's autumn in the Northern Hemisphere and here's a tribute to the beauty Mother Nature paints across our landscape.
First Launch
Before ET started zipping around the universe using their hyper-drive, warp-drive, jump-drive, starburst, hyper-space, wormholes, and/or FTL (faster than light) engines, they probably first climbed out of their local gravity well using chemical rockets just as we do today. (That is assuming that the ACME - Really Big Rubber Band didn't work for them either!)
“First Launch” depicts the inhabitants of a moon orbiting a ringed planet setting off on their first journey into space.
Parallel Universe
The Milky Way galaxy has about 300 billion stars, and with the latest data gathered from Kepler and other sources there is the potential that most of these stars have at least one planet (probably more) orbiting them, and some of these planets may be in the habitable zone. And, if you consider the possibility that these planets may have moons, some of which may be habitable, then there are a whole lot of places out there for life to evolve. (Remember, this is just one galaxy out of hundreds of billions of galaxies in our observable universe.) Now consider multiverses...an infinite number of other universes that may co-exist with ours.
"Parallel Universe" illustrates a habitable moon of a gas giant in a binary star system somewhere out there, with some very familiar architecture...
Distant Shores
With over
3700 confirmed exoplanets and several thousand more potential
candidates located in a small part of our galaxy, I can't believe
there is not life out there somewhere. "Distant Shores" is
a glimpse of one possible exoplanet with a variety of life
inhabiting it that parallels the beautiful planet we
inhabit.
Mainly from a refusal to believe that we are destined to be sequestered forever in this backwater of the galaxy, and the confidence I have that we will someday find a way to conquer the immense distances between the stars, I offer “Dinner for Two with a View”. A gas giant, in the habitable zone of a star, dances with many moons, one of which is a water-world paradise of sorts and makes the perfect vacation destination. Make your reservations soon! Oh, and don’t drink the water!
Sooner or later we will have people on the Moon and they may find that their electronic link to the home world does not satisfy their visceral need to connect with the Earth. A lone astronaut journeys through shades of greys, blacks and whites to take in the view of our home planet with its swirls of white over the blues, browns and greens.
Ringworld
We have a moon, but imagine if we had rings! Of course, if we did, we would be as lackadaisical about the rings as we are about our moon. But here, in "Ringworld", somewhere in this vast cosmos, a family takes in the view of a ringworld in what was once a trinary star system. Long ago, one of its stars went supernova and left behind a stellar-mass black hole that now feeds off its closest companion and blasts jets of high energy particles and X-rays into the surrounding galaxy. What a view!
Meanwhile, back on Earth. Enjoy the sun rising and flirting with the crescent moon over the Atlantic Ocean to start a new day!
Life started in the seas. Water provided the medium and all the nutrients needed for life to form from simple single-celled lifeforms to multi-cellular plants and eventually animals. But, perhaps it didn't evolve spontaneously. Perhaps it was seeded by comets, asteroids and meteors from other habitable planets. This is known as panspermia and the theory is supported in part by the meteors we find on Earth that are directly traceable to Mars. Who knows what pieces of Earth we may find on Mars.
Ice Fairies
Ice fairies come out to mark the winter solstice, the day the sun is at its lowest altitude at noon in the Northern Hemisphere bringing the shortest day of the year. Ironically, the Earth is closest to the sun at this time of year (the closest point or perihelion will occur on January 3, 2018), but the tilt of planet causes the Northern Hemisphere to experience shorter days and less direct sunlight ushering in winter in the north and conversely, summer in the Southern Hemisphere.
Homeward Bound
Life undoubtedly exists or has exited or will exist on other planets scattered about our galaxy and beyond. These beings will explore their planet and eventually look to the stars to satisfy their wanderlust. In the image "Journey to the Setting Moons" we see a ship leaving the harbor and in "Homeward Bound" we see the ship returning to its home port half a world away.
Ring
Tree
Inspired by the 'dream tree' in the wonderful movie "The BFG" (The Big Friendly Giant, by Roald Dahl) "Ring Tree" combines the magic of an aurora with a shimmering fog and rising ringed planet.
Rings are probably more common in the cosmos than one might expect. Some are bold, dramatic rings like the ones encircling Saturn, while others are wispy, barely visible rings like the ones around Jupiter, Uranus and Neptune. In fact it was recently discovered that a small (1,218 miles long (1,960 km)), potato-shaped dwarf planet, Haumea, has a ring and two small moons.
