Ultimate space simulation software

Mouthwash
Explorer
Topic Author
Posts: 164
Joined: 22 May 2017

### Could you smack into a planet traveling at max speed?

When I face the surface of a planet, crank speed up to max and move towards it, I just find myself in the space between galaxies. So I'd guess the answer is no... but maybe it's just too close? I doubt SE simulates the user actually moving through every centimeter of space, so maybe it 'skips' across at intervals.

Could you do it traveling in intergalactic space?
Last edited by Mouthwash on 23 Nov 2017 12:02, edited 1 time in total.

Watsisname
Science Officer
Posts: 1331
Joined: 06 Sep 2016
Location: Bellingham, WA

### Could you smack into a planet traveling at max speed?

Mouthwash wrote:
Source of the post I doubt SE simulates the user actually moving through every centimeter of space, so maybe it 'skips' across at intervals.

Basically this.  No computer calculation can be continuous, so your flying through space is not continuous.  If you are flying at 10c and SE is running at 60fps, then each frame is separated by about 50,000km.  That is several times wider than Earth, so if you were to fly at Earth like this you will almost certainly pass right through it.  At speeds greater than light years per second, you have pretty much zero chance of hitting a planet, or even a star.

I encountered a similar thing in Kerbal Space Program, when putting two spacecraft in exactly the same orbit but in opposite directions, hoping for a high-velocity collision.  I calculated the probability of the two craft being inside each other during a single frame to be about 15%, and indeed it took several times of passing straight through each other before a collision finally happened.

Mouthwash
Explorer
Topic Author
Posts: 164
Joined: 22 May 2017

### Could you smack into a planet traveling at max speed?

Watsisname wrote:
At speeds greater than light years per second, you have pretty much zero chance of hitting a planet, or even a star.

I don't care about the chances. Is it theoretically possible?

Watsisname
Science Officer
Posts: 1331
Joined: 06 Sep 2016
Location: Bellingham, WA

### Could you smack into a planet traveling at max speed?

There is probably some velocity for which it is fundamentally impossible to hit an object, because it can't load and register a collision in time, but I don't know what it would be and it would probably still be frame-rate dependent.  But if you're cruising at ludicrous speed, even if the probability is not zero, it is so small that it might as well be zero.  At 60fps and 1LY/s, the odds of hitting an Earthlike planet are less than one in a million.

problemecium
Space Pilot
Posts: 92
Joined: 30 Dec 2016

### Could you smack into a planet traveling at max speed?

Indeed, such an event would be dependent on an extraordinarily fast loading speed. Possibly if you turn on the "Immediate" loading mode it can happen, but at very high speeds if you flew through a galactic core or other dense region with lots of potential collision targets, the game would get horribly laggy.
In intergalactic space it's impossible (barring a glitch... praise the Kraken) because to date SpaceEngine does not simulate intergalactic material of any kind.
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Formerly known as "parameciumkid." Still playing on Intel HD Graphics 4000 ^^ My computer turns 5 this Summer.

Mr. Missed Her
Astronaut
Posts: 66
Joined: 09 May 2017
Location: Cistuvaert, Verge Vendor

### Could you smack into a planet traveling at max speed?

How does Space Engine simulate a planet's interior? If it doesn't simulate the interior at all, then collisions would only happen when the spaceship is touching the surface or the atmosphere. This would complicate things.
Space is very spacious.

XBrain130
Explorer
Posts: 284
Joined: 26 Nov 2016
Location: Italy
Contact:

### Could you smack into a planet traveling at max speed?

Mr. Missed Her wrote:
Source of the post it doesn't simulate the interior at all

that is indeed the case
SpaceEngine's Italian Discord server: https://discord.gg/NhQbEbC

problemecium
Space Pilot
Posts: 92
Joined: 30 Dec 2016

### Could you smack into a planet traveling at max speed?

SpaceEngine doesn't need to simulate the interior in order to detect when a player is inside the planet - it can simply check whether the distance to the player is less than the planet's radius (plus the terrain height where applicable) and push the player back out.
ᴩʀoʙʟᴇᴍᴇᴄɪᴜᴍ﹖
Formerly known as "parameciumkid." Still playing on Intel HD Graphics 4000 ^^ My computer turns 5 this Summer.

teaarmy
Observer
Posts: 5
Joined: 22 Sep 2017

### Could you smack into a planet traveling at max speed?

It should be possible, you just have to be extremely lucky. If you're travelling at 1ly/sec through our solar system with earth exactly on your way, there should be a chance of 8,08*10^-8 or 0,0000000808% to hit the planet. That is four times more likely than to win the lottery (at least where I live)^^

I think you can calculate your luck to hit any object with: speed/framerate*diameter
https://www.youtube.com/user/teaarmy <-- To my Space Engine Videos

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