# Tag Info

### Are Mass Effect "style" guns possible?

The previous answers address the projectile viability, but there's a logical consistency problem, too. Real weapons don't have the firepower they have because it's the "right amount", they ...
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### Are Mass Effect "style" guns possible?

Sure Flechette style ammunition works just fine. The late 1980s weapon in the second link fired a 0.66g metal projectile - though probably not fast enough to make a pretty light show. Considerations ...
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### Are Mass Effect "style" guns possible?

The answer is "no," but just how it fails depends on the details. If the projectile is a "shaving", a curved sheet of material, rather than axisymmetric, then it's going to be ...
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### Can Mars disintegrate entirely in this scenario?

Given " ... You can use millions of super-deep drillings and nuclear bombs to introduce fractures in the Martian crust if that helps.." then Ender Wiggins and Dr Device can make it a ...
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### Exoplanet sky with suspended ice crystals

Mother of pearl. Curiosity rover spies colorful iridescent clouds on Mars "If you see a cloud with a shimmery pastel set of colors in it, that's because the cloud particles are all nearly ...
• 273k
Accepted

### Can Mars disintegrate entirely in this scenario?

Yes, and no need to introduce fast rotation, or nukes or anything similar. The Roche limit for liquid bodies is $d=2.544R \sqrt[3]{\frac{\rho_M}{\rho_m}}$, where $R$ is the radius of the more massive ...

### Can Mars disintegrate entirely in this scenario?

One part of the question says: Before the fly-over, Mars's rotation can be accelerated to up to 1 Martian day per hour if that helps Mars to disintegrate. Would that help Mars break up into pieces? ...
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### Can Mars disintegrate entirely in this scenario?

Keeping in mind many of the theories of the Formation and evolution of main rings. And as you mentioned Mars could travels within the Roche limit, Édouard Roche himself proposed that the rings are ...
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Accepted

• 273k
1 vote

### Racing Around the Edge of a Black Hole

The person in the nearer spaceship would corner a lot faster, but not for the reason you think. Angles aren't Euclidean close to a black hole. That's why light bends around them. Given the proper ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Ceremonial tea cakes Your edited post says: each vehicle needs a few hundred MW 60% of energy is captured Using E_captured = 0.6 * mc^2, this means m = E_captured / (0.6 * c^2), and m/t = E_captured/...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Well, if you are really serious about scientific accuracy then you should at least be aware of the law of conservation of baryon number. If it is strictly true, then the only way to convert whole ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Iron: the poop of stars I would presume that you'd want something that provided consistent energy output. Having a reactor that sometimes fizzles and sometimes explodes is a bad model. Thus, you're ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Water Common and cheap. Easy to contain. Easy to move from place to place in variable amounts according to need. Minimally reactive. Useful for biologic lifeforms on the ship. Useful as shielding ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Different ships will use different fuels Much like today's rockets, the principle consideration will be cost. You have to weigh the potential of a fuel against its mass, thrust, cost, and mission ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

The question declares: the matter does not need to be specially prepared or even homogeneous. Trash as you would Mr Fusion. If it is true matter to energy, why wouldn't it be like Doc Brown of 'Back ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

If I’m reading your question correctly, the answer really depends on what you choose for the characteristics of your engines and generators; their efficiency, waste products, energy requirements, ...
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1 vote

### What would a spacefaring race use as fuel for their matter-to-energy reactors?

It depends on what you mean by "convert matter directly to energy". If you have something that can generate positrons and antiprotons and, with few beams, you totally annihilate the matter ...
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1 vote

### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Normally they would use the highest density materials they could find because physical space is a valuable commodity in outer space. Lead comes to mind. Second if they had any dangerous materials like ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Solar Wind Converting Mass to Energy creates such a crazy amount of energy that you barely need any mass. One kilogram of matter has ~ 25,000 Gigawatt-hours of energy. Since a normal US house uses 10,...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

First it might be a good idea to ballpark how much matter you would need. From Newtonian physics it takes about $62$ megajoules of energy to get a kilogram completely off planet earth, so 2 kilos ...
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Accepted

### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Mine tailings: In your scenario, you can destroy matter. But even waste materials for your civilization out in space are made of the things you find valuable. In space, people are interested in places ...
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### What would a spacefaring race use as fuel for their matter-to-energy reactors?

Waste. Landfill sites are expensive to set-up properly. The sites can eventually have housing built on them, but not without extensive plumbing to allow methane and noxious gasses to escape safely. ...
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1 vote

### The immediate and long term effects of slashing wounds in microgravity

So, this is a bit of postulation based on what we know from the real world... First off, despite a certain television program's insistence that gravity is part of the healing process, the effects ...
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