What Sci-Fi clichés do you resent?

[XZ923]

My biggest general sci-fi beef has always been the speed of shots fired. From Star Wars blasters to Star Trek phasers and everything in between, you always see slow-moving energy emissions that the target (especially if it's a "good guy") can easily duck away from. My assumption is that rounds fired from weapons in the future would have greater velocity than contemporary ammunition, not tiny fractions of that number.

Another one: the "critical weak point". It was interesting back in 1977 when Luke Skywalker fired a pair of proton torpedoes into the exhaust port, but since then it's in virtually everything. The bad guys always build some scary "ultimate weapon" and the good guys then spend all of 30 seconds figuring out some crucial design flaw that the ultimate weapon's designers somehow missed in their years of planning and construction. The "all hope is lost but then the hero fires the one perfect shot and saves the day" plotline needs to be taken out to pasture and shot. I actually broke out laughing in the theatre the first time I saw Star Wars VII and they were talking about how to take down Starkiller Base because the horrible acting coupled with the same tired, recycled plotline seemed more like satire than a real movie.

 

[Stephenk53]

My biggest general sci-fi beef has always been the speed of shots fired. From Star Wars blasters to Star Trek phasers and everything in between, you always see slow-moving energy emissions that the target (especially if it's a "good guy") can easily duck away from. My assumption is that rounds fired from weapons in the future would have greater velocity than contemporary ammunition, not tiny fractions of that number.

Another one: the "critical weak point". It was interesting back in 1977 when Luke Skywalker fired a pair of proton torpedoes into the exhaust port, but since then it's in virtually everything. The bad guys always build some scary "ultimate weapon" and the good guys then spend all of 30 seconds figuring out some crucial design flaw that the ultimate weapon's designers somehow missed in their years of planning and construction. The "all hope is lost but then the hero fires the one perfect shot and saves the day" plotline needs to be taken out to pasture and shot. I actually broke out laughing in the theatre the first time I saw Star Wars VII and they were talking about how to take down Starkiller Base because the horrible acting coupled with the same tired, recycled plotline seemed more like satire than a real movie.

I watched a video about the speed of shots in star wars and according to their speeds they were very inconsistent even in the same scenes

I also hate the reused plot

 

[AgentSmith]

Yes, you see a 'turret" with a rate of fire about like a WW2 anti-aircraft gun firing 40 mmm shells trying to hit a colonial starfighter.
But the whole idea of space battles needs to be rethought. If you are zipping along at 100 km/s, which we can't do now, no one is going to throw metal at you. Even EM guns won't attain a high enough velocity. So only light or some type of energy beam at near-light speed will work. But its going to hit your ship most of the time, with a velocity 3000 times that of your ship.

 

[AgentSmith]

And I hate The Force be with you and Beam me up Scotty. Fine at one time like a quarter century ago.

And please, deity ,no more depressing Alien-type movies, with all hope lost at the end, and the crews doomed to host face-huggers for all eternity. A movie can't be hopeless.

 

[rootone]

Why is alien life usually presented in movies so it looks like humans dressed in weird clothes!
and what's the fashion with the imperial Rome thing?

 

[Chris Miller]

Yes, you see a 'turret" with a rate of fire about like a WW2 anti-aircraft gun firing 40 mmm shells trying to hit a colonial starfighter.
But the whole idea of space battles needs to be rethought. If you are zipping along at 100 km/s, which we can't do now, no one is going to throw metal at you. Even EM guns won't attain a high enough velocity. So only light or some type of energy beam at near-light speed will work. But its going to hit your ship most of the time, with a velocity 3000 times that of your ship.

You got to read Cixin's Three Body Problem trilogy. Best space battle ever!

But I agree with you. I especially hate when our good old military takes on alien invaders from some distant star and holds their own.

 

[Stephenk53]

Why is alien life usually presented in movies so it looks like humans dressed in weird clothes!
and what's the fashion with the imperial Rome thing?

Yeah its always either basically just a green human (or literally green human like in Gaurdians of the galaxy) or they are horrifyingly ugly and parasitic

 

[Chris Miller]

Yeah its always either basically just a green human (or literally green human like in Gaurdians of the galaxy) or they are horrifyingly ugly and parasitic

Or like in Battlestar Galactica, where you have the Cylons who (happily for special effects) look exactly like us.

 

[Stephenk53]

Or like in Battlestar Galactica, where you have the Cylons who (happily for special effects) look exactly like us.

True

 

[cosmik debris]

Yes, you see a 'turret" with a rate of fire about like a WW2 anti-aircraft gun firing 40 mmm shells trying to hit a colonial starfighter.
But the whole idea of space battles needs to be rethought. If you are zipping along at 100 km/s, which we can't do now, no one is going to throw metal at you. Even EM guns won't attain a high enough velocity. So only light or some type of energy beam at near-light speed will work. But its going to hit your ship most of the time, with a velocity 3000 times that of your ship.

It seems to me what is needed is a guided device (missile etc). Space battles would probably be over much larger distances that are usually depicted in films and ballistic weapons allow too much manoeuvring time for the defender.

Cheers

 

[GTOM]

Yes, you see a 'turret" with a rate of fire about like a WW2 anti-aircraft gun firing 40 mmm shells trying to hit a colonial starfighter.
But the whole idea of space battles needs to be rethought. If you are zipping along at 100 km/s, which we can't do now, no one is going to throw metal at you. Even EM guns won't attain a high enough velocity. So only light or some type of energy beam at near-light speed will work. But its going to hit your ship most of the time, with a velocity 3000 times that of your ship.

If lasers have an effective range of a few thousand kilometers, but closing speed is high, one has to prepare for kinetics range. That also applies to orbital and asteroid mine combat.

 

[BWV]

Projectiles traveling at relativistic speeds could well be the most effective weapon, a 100g projectile traveling at 0.8C would have about a megaton of kinetic energy

 

[Khashishi]

It would be effective against an immobile target like a planet, but what good would it be against a starship?

 

[GTOM]

Projectiles traveling at relativistic speeds could well be the most effective weapon, a 100g projectile traveling at 0.8C would have about a megaton of kinetic energy

I think relativistic projectiles are overrated. Due to Doppler shift, they emit strong X-rays. Even if they are .99c defence will be able to detect them in time, and shatter them with debris. Boost them require insane amount of energy, shatter them dont.

 

[Vanadium 50]

Due to Doppler shift, they emit strong X-rays. Even if they are .99c defence will be able to detect them in time,

On your first point, a room-temperature projectile at .99c is just starting to glow in the visible.

On your second, a projectile shot from the moon at .99c gives us 10 milliseconds to detect, identify and destroy it.

 

[Janus]

Boost them require insane amount of energy, shatter them dont.

As Vandium 50 pointed out, you will have very little time to detect said projectile (at 0.99c it would be following close on the heels of its light signature). This means its going to be relatively close before you even detect it. Even if you allow zero time between detection and the firing of counter measures the projectile will have closed on you even more before your defense reaches it.
And even then, just shattering it will not do you much good, as you have now just turned a single projectile into a shotgun blast carrying the same total KE. Unless your shattering weapon itself has enough energy to deflect/disperse that debris field sufficiently enough, you really haven't helped yourself. (This actual reminds me of another gaff I remember from an SF movie. I believe its was "Deep impact". A large comet was going to hit the Earth. At the last minute it was blown up and the resulting small debris "just burned up harmlessly" in the atmosphere. No mention of the fact that even if none of the pieces survived to reach the ground intact, the total KE of that original comet was still contained in that debris and was being pumped into the atmosphere as heat. There's no telling what kind of a climatic and ecological disaster that would result from that.)

 

[GTOM]

On your first point, a room-temperature projectile at .99c is just starting to glow in the visible.

On your second, a projectile shot from the moon at .99c gives us 10 milliseconds to detect, identify and destroy it.

First, ok i overestimated Doppler shift.
I assumed the projectile was fired from interplanetary distance.
And shattered before it could get closer than the moon.

 

[Vanadium 50]

I assumed the projectile was fired from interplanetary distance.
And shattered before it could get closer than the moon.

This has the same problems Janus pointed out. You have very little time to detect, identify and destroy a hard-to-see object. If you blow it up at the moon, the fragments are moving apart at kilometers per second, but it has only a second before it reaches earth. A 100 kg projectile is 100,000 megatons. As Janus says, that energy has to go somewhere.

 

[GTOM]

This has the same problems Janus pointed out. You have very little time to detect, identify and destroy a hard-to-see object. If you blow it up at the moon, the fragments are moving apart at kilometers per second, but it has only a second before it reaches earth. A 100 kg projectile is 100,000 megatons. As Janus says, that energy has to go somewhere.

Only 1 km/s separation speed, if it hits a piece of debris, and the energy of a small nuke released?
Well luckily, probably we will sooner have generation ships able to achieve some percent of c, than relativistic projectiles

 

[Ryan_m_b]

Only 1 km/s separation speed, if it hits a piece of debris, and the energy of a small nuke released?
Well luckily, probably we will sooner have generation ships able to achieve some percent of c, than relativistic projectiles

Not sure that logic holds. A generation ship is essentially a small island ecosystem that has to carry with it a steady state industrial economy and population of sufficient size to supply a labour force to maintain that economy and maintain the health of the ecosystem. That's not going to be small, we're talking tens to hundreds of millions of tonnes if not billions. If you have the technology and energy to send such an island on a journey to another star at at even a tenth of a percentage of light speed then the same investment of energy could launch a significantly smaller mass at a significantly higher velocity.

 

[GTOM]

Not sure that logic holds. A generation ship is essentially a small island ecosystem that has to carry with it a steady state industrial economy and population of sufficient size to supply a labour force to maintain that economy and maintain the health of the ecosystem. That's not going to be small, we're talking tens to hundreds of millions of tonnes if not billions. If you have the technology and energy to send such an island on a journey to another star at at even a tenth of a percentage of light speed then the same investment of energy could launch a significantly smaller mass at a significantly higher velocity.

It isn't only overall energy that counts.
I did some calculations, if they are correct, at least they help someone intends to write a not so far future story i think.
How can a rocket achieve 1000 km/s? If it is mass is about 10 ton, and it has a GW reactor, it still leaves Pluto sooner than achieve that speed.
(Rocket equations with 1000 km/s exhaust could grant 0,2 m/s2 acceleration. But efficiency isn't 100%, fuel mass, cooling issues, so it is good to have 0,1 m/s2. Now calculate acceleration path.)
If they want to build a coilgun to boost it... with a million g acceleration, the length of the cannon should be still more than 50km.

A generation ship can have years to achieve such velocity.