I would like to have a space whale type creature that can fly through space. It would be very large and fly from planet to planet using orbital maneuvers. I want this creature to be able to do it naturally as if the species evolved in space as apposed to on a planet. I imagine wings wouldn't work as there is no air to push against. The only thing I can think of is it spitting in one direction to propel it in the other but I don't love that idea.

  • $\begingroup$ What would she eat and breathe? $\endgroup$
    – o0'.
    Jun 22, 2015 at 21:26
  • $\begingroup$ I was thinking she could get energy from the sun and perhaps eat asteroids and moons. Does she have to breathe? $\endgroup$
    – JakeP
    Jun 22, 2015 at 21:31
  • $\begingroup$ How fast do you want your creature to move? $\endgroup$
    – Frostfyre
    Jun 22, 2015 at 21:32
  • $\begingroup$ Quite fast. Should be able to move from one star to another within a week at least. This might be impossible... I'd like to avoid giving it the ability to warp or bend space but that might be the only way... EDIT: Also she wouldn't travel by flying directly to its destination. She would "surf" stars and planet's orbits and only expend her energy to make orbital maneuvers. $\endgroup$
    – JakeP
    Jun 22, 2015 at 21:35
  • 6
    $\begingroup$ Stars are generally light years apart. To travel between stars in a matter of weeks would require your creature to move at many times the speed of light. There are no known methods for doing this. $\endgroup$ Jun 22, 2015 at 23:06

5 Answers 5


You can Sail On Light:

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It's very slow, but with a large reflective surface you can use solar pressure to get acceleration. This would allow your whale to maneuver around a solar system.

Keep in mind that because of orbital mechanics, you can even use this to go inwards toward the sun (acceleration takes you out -> your orbit is now elliptical -> eventually you come back in).

  • $\begingroup$ Oh, I love this idea. I was just reading about that Carl Sagan light sail too! Thing is, I would like the creature to be able to rotate and push in a direction so it could "burn prograde or retrograde" as we do with spaceships as to adjust it's orbit. Would turning the light sail have that effect? $\endgroup$
    – JakeP
    Jun 22, 2015 at 21:39
  • $\begingroup$ Gah! Beat me to the solar sail. I waited to hear how fast the creature needed to move. From the response, solar sails might not meet the OP's needs. $\endgroup$
    – Frostfyre
    Jun 22, 2015 at 21:39
  • $\begingroup$ @JakeP Your creature's sails could be wings. That would give you a winged space creature. $\endgroup$
    – Frostfyre
    Jun 22, 2015 at 21:40
  • 1
    $\begingroup$ Thing is this creature is going to be huge. Like a third of the earth huge. Would that be large enough to gain significant speed from a solar sail? $\endgroup$
    – JakeP
    Jun 22, 2015 at 21:43
  • $\begingroup$ Related: starwars.wikia.com/wiki/Neebray That thing flies in space. $\endgroup$
    – Aify
    Jun 22, 2015 at 22:59

It could also use gravitational slingshots to gain speed for interplanetary travel, and maybe have some kind of gas release (Such as waste gases like methane from digestion) that are able to be 'farted' out (For lack of a better term) to adjust direction manually, like a natural rocket. The act of letting gas out would alter direction, like a breach in a space habitat.

I'm more curious as to how the creature wouldn't be killed from the pressure differences between vaccuum and.. Anything else, most liquids would boil in space. I am presuming some natural kind of radiation resistance is evolution at work.

Another idea for mineral intake is that the creature works similar to a modern basking shark (And the like) in which they filter feed. Instead of small animals/ bacteria, a nice idea may be that they reside in a densely packed nebula and/ or a ring system around a gas giant, allowing them to take in minerals they need from gases and dust in space itself, and potentially high atmospheres of planets.

Some food for thought ^ ^

If you do this,you definitely need space dragons of some sort as a natural predator. Maybe even parasites that live inside the creature like Mynocks from Empire Strikes Back :P

In regards to a comment about the SW being about 1/3rd Earth's size, I'd like to point out some stuff to consider (I don't have enough rep to reply directly); -This thing is going to have a noticeable gravitational pull; it will affect the tides of an Earthlike planet like our own moon. This could be part of the folklore for X race, that these sky whales are interpreted as some kind of danger omen in their beliefs. Or gods, who knows?

-A creature that big will require tremendous amounts of energy to live. Due to space being space, I'd say the best option is to have it be a slow nicer but have a slow metabolism; it filter feeds and gains energy that is released slowly as opposed to quickly. This would make it a slow creature, though remember space is big. It takes 8 minutes for light to hit us from Sol, and 11 for us to send light to Mars. This thing will be travelling for months or years at a time between planets, so it is vital that it is not burning it's energy too quickly. Gas giants? No-no, the sun is too far away (Unless it's a rare circumstance like an extrasolar capture) that if it gains energy from light, it's not getting energy that far away.

  • $\begingroup$ I guess you would want avoid getting in the wake of a gigantic flatulence propelled space whale... $\endgroup$
    – papirtiger
    Jun 23, 2015 at 1:05
  • 2
    $\begingroup$ Well there's no sound in space. That's a blessing in of itself :P $\endgroup$
    – BaconShelf
    Jun 23, 2015 at 7:18

If a true reactionless drive is possible, then you could simply posit that your space whale evolved one biologically. And if it could do that, then surely it could evolve a kind of fusion power source to power it, as well. The advantage of a reactionless drive is that you are somewhat freed from the Tsiolkovsky rocket equation, so you should be able to accelerate to very high speeds (though only slowly, given current designs).

Also, you have to consider that at relativistic speeds, you really need good shielding, or you will get irradiated to death (a particular problem for biological systems). Your whale will need some kind of special carapace to protect it from cosmic rays and other hard radiation.

  • $\begingroup$ It's not possible. But that didn't stop a number of SF stories from doing exactly that! $\endgroup$
    – JDługosz
    Feb 24, 2016 at 7:48
  • $\begingroup$ The jury is still out on the EmDrive and Cannae...there may be a lot of skepticism, but no definitive null result from replicated experiments. Rather, a lot of unexplained anomalies. $\endgroup$ Feb 25, 2016 at 21:52
  • $\begingroup$ I beg to differ, and have commented elsewhere on the hype vs actual results being interpreted. The reports describe noise below the level of sensitivity. The reports creatively interpret that as "unexplained something going on" and ignore the fact that it's in the wrong direction or on the control run. $\endgroup$
    – JDługosz
    Feb 26, 2016 at 1:24
  • $\begingroup$ See here for example. I can't find my commentary on Wired's write-up: it must be in a comment not an Answer and not searched. The paper he is citing is a null result, and the reader of the paper is trying to twist his way out of that or doesn't understand how real experiments work as opposed to mathematical perfection. $\endgroup$
    – JDługosz
    Feb 26, 2016 at 1:37
  • $\begingroup$ I've read quite a few articles on this drive, and have to say that all of the naysayers are doing so from their armchairs, rather than putting their money where their mouths are and replicating the experiment. All of the labs which have actually tried it have reported anomalous results which require further investigation. The article you cite is 4 years old, and more experiments have been conducted since then. I have not found a single lab claiming no observed effects. $\endgroup$ Feb 26, 2016 at 21:51

Magnetic Sails
Work by interacting with the Solar Wind and generate about the same thrust per weight as solar sails. However, they have some abilities that Solar Sails do not.

Electric Sails
Work by interacting with the Solar Wind too. The E-sail has less research behind it.

The book The Black Cloud posited an intelligence formed by a "Black Cloud". The cloud used magnetohydrodynamics to propel chucks of the cloud at sizable fractions of the speed of light as its means of propulsion. Unfortunately, all that was a bit of hand waving.

The problem is that space is too empty to sustain any sort of life that we know of. Not enough nutrients and not enough readily available energy sources in between the planets (let alone the stars).


To dependably move fast, it would have to have a black hole inside, and then use a form of directed gravity to pull itself towards its destination.

Either that or somehow open wormholes.


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