UFO / UAP

[Highway Man]

Could you give it a try

He is a quitter not a tryer. I cannot believe how he can dismiss things in such an arrogant way.

 

[Highway Man]

Same as my own? What do you mean?
That the distance to the outer edge of our solar system is insurmountable?

Or that fact that it would take more portable energy than is present on earth to reach anywhere near there?

Or that light speed or anywhere near it is impossible?

Or that humans can't live for 70'000 years?

All of the above. Who knows what the future holds.

 

[noseall]

Evidence is there but you refuse to believe it Jimmy...

If its in your head, how are we meant to see it boyo?

Post it up. I'll wait....

 

[noseall]

ok now you are just being a silly troll again.

Mars is never going to happen

How long will it take to accelerate to 20% of light speed at 5g. =14.1 days
How long will it take to get to the nearest star at 20% of light speed = 21.2 years + 14.1 days
Does an object in a vacuum without gravity continue at the same speed without propulsion = Yes

calculations below:

Spoiler

Q1 ) Calculate how long it will take to accelerate to 20% of the speed of light (0.2c) at an acceleration of 5g, we can use the formula for time under constant acceleration.

First, we need to know the acceleration aa and the final velocity vv.

• The acceleration due to gravity on Earth is g≈9.81 m/s2g≈9.81m/s2, so 5g is:

a=5×9.81=49.05 m/s2a=5×9.81=49.05m/s2

• The speed of light is c=3×108 m/sc=3×108m/s, so 20% of the speed of light is:

v=0.2c=0.2×3×108=6×107 m/sv=0.2c=0.2×3×108=6×107m/s
Now, using the basic kinematic equation:

v=a×tv=a×t
Solving for tt:

t=va=6×10749.05≈1.22×106 secondst=av=49.056×107≈1.22×106seconds
So, it will take approximately 1.22 million seconds, or about 14.1 days, to accelerate to 20% of the speed of light at an acceleration of 5g.

Q2 ) calculate how long it will take to reach the nearest star (Proxima Centauri) at 20% of the speed of light, we need the following information:

• Distance to Proxima Centauri: approximately 4.24 light-years.
• Speed: 20% of the speed of light (0.2c).

Step-by-Step Calculation:​

1. Convert the distance to the nearest star into a more useful unit:
   1 light-year is the distance that light travels in one year, which is about 9.461×10159.461×1015 meters.
   So, the distance to Proxima Centauri is:
   4.24 light-years=4.24×9.461×1015 meters≈4.01×1016 meters4.24light-years=4.24×9.461×1015meters≈4.01×1016meters
2. Determine the travel speed:
   20% of the speed of light is:
   0.2c=0.2×3×108 m/s=6×107 m/s0.2c=0.2×3×108m/s=6×107m/s
3. Calculate the time:
   Time is distance divided by speed:
   t=distancespeed=4.01×10166×107≈6.68×108 secondst=speeddistance=6×1074.01×1016≈6.68×108seconds
4. Convert the time into years:
   To convert seconds into years, divide by the number of seconds in a year (31,536,000 seconds per year):
   t=6.68×10831,536,000≈21.2 yearst=31,536,0006.68×108≈21.2years

Final Answer:​

It will take approximately 21.2 years to reach Proxima Centauri at 20% of the speed of light.

Q3) Does an object in a vacuum without gravity continue at the same speed without propulsion

Yes, in a vacuum without gravity (and assuming no other forces are acting on the object), an object will continue to move at the same speed in a straight line indefinitely. This is a direct consequence of Newton's First Law of Motion, also known as the law of inertia.

In simple terms:

• An object in motion will stay in motion at the same speed and in the same direction unless acted upon by an external force.
• In the vacuum of space, there is no air resistance, friction, or other forces to slow the object down. Similarly, in the absence of gravity, there are no gravitational forces pulling it in any direction.

This means if you give an object an initial velocity in space, it will continue at that velocity (speed and direction) forever (or until it encounters an external force, like gravity from a nearby planet or star, or some other interaction).
.

All theoretic and beyond the realms of human achievement.

Outer edges of our solar system - not in our wildest dreams boyo.

 

[MNW67]

He is a quitter not a tryer. I cannot believe how he can dismiss things in such an arrogant way.

You try it, then. I bet you get cold feet

 

[noseall]

I really don't think you grasp the scale of what you're describing here.

The bloke is just trolling and posting up theoretic nonsense to excite the trolls.

 

[pete01]

The bloke is just trolling and posting up theoretic nonsense to excite the trolls.

Well it certainly got you excited

 

[IT Minion]

Other than using nuclear weapons as a propulsion system, or antimatter, high efficiency engines are low thrust engines.

Assuming your interstellar craft is as light as the ISS (400 tons, no radiation shielding) then to get 1G you need roughly 4MN of thrust. That's roughly the same as a Raptor engine. Five of them would be 5G. Unfortunately those raptor engines drink 140kg Methane per second. So approximately 170,000 tons of Methane.

BUT you need to accelerate that Methane as well. Assuming a more leisurely start of 1G acceleration you need another 425 engines, which would also each be drinking 140kg of Methane per second which would also have to be accelerated.

Also, we didn't even mention the liquid Oxygen, which is three times the mass.

In the end you're looking at approximately 1 Trillion tons of Oxygen and Methane. But good news it'll only take 60 years of global production of Methane. Oh and you can't slow down at the other end.

Or go the other way, take a much more efficient engine, say a hall effect thruster. The biggest ever built provides 5.4N of thrust and weighs 230kg, so can accelerate itself (not including payload or fuel) at a staggering 0.02 m/s or around 0.002G.

 

[motorbiking]

I really don't think you grasp the scale of what you're describing here.

I'm not suggesting it's happening any time soon.

 

[motorbiking]

Other than using nuclear weapons as a propulsion system, or antimatter, high efficiency engines are low thrust engines.

Assuming your interstellar craft is as light as the ISS (400 tons, no radiation shielding) then to get 1G you need roughly 4MN of thrust. That's roughly the same as a Raptor engine. Five of them would be 5G. Unfortunately those raptor engines drink 140kg Methane per second. So approximately 170,000 tons of Methane.

BUT you need to accelerate that Methane as well. Assuming a more leisurely start of 1G acceleration you need another 425 engines, which would also each be drinking 140kg of Methane per second which would also have to be accelerated.

Also, we didn't even mention the liquid Oxygen, which is three times the mass.

In the end you're looking at approximately 1 Trillion tons of Oxygen and Methane. But good news it'll only take 60 years of global production of Methane. Oh and you can't slow down at the other end.

Or go the other way, take a much more efficient engine, say a hall effect thruster. The biggest ever built provides 5.4N of thrust and weighs 230kg, so can accelerate itself (not including payload or fuel) at a staggering 0.02 m/s or around 0.002G.

You're applying today's tech to the problem. Nobody serious is suggesting, we can do any of this today, with the right funding. You're also assuming the vessel will start and end as one.

 

[noseall]

I'm not suggesting it's happening any time soon.

Humans will be long gone and there may be a US flag on Mars, if we are lucky.

 

[noseall]

You're applying today's tech to the problem.

The distance is far too great for humans. It will not happen.

 

[motorbiking]

Humans will be long gone and there may be a US flag on Mars, if we are lucky.

make your mind up.

Mars is a pipe dream and it's practically in touching distance, in the grand scheme of space.

 

[Highway Man]

Humans will be long gone and there may be a US flag on Mars, if we are lucky.

So you believe Mars is possible then for us to go ?

 

[Highway Man]

Plying football on the Sun is not possible.

Humans reaching the edge of our solar system alive (or even half way) is not possible.

The UFO trolls on DIYnot having a rational thought, seems to be impossible.

So you know for a fact that life does not exist on the sun at the moment?