# Alien Earth 13 light years away

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#### JTsyo

##### Lifer
No need to go faster than light.

13 light years away would only take a ship a little over 5 years travel time with 1g constant acceleration half the way there and 1g deceleration for the latter half.

Although on earth it would appear to take almost 14 years to get there due to relativity.

You would think we wouldn't be too far from being able to launch a unmanned probe capable of such a trip.

If you travel for 5 years at 1g, you would be 5 time the speed of light.

#### meob

##### Member
No need to go faster than light.

13 light years away would only take a ship a little over 5 years travel time with 1g constant acceleration half the way there and 1g deceleration for the latter half.

Although on earth it would appear to take almost 14 years to get there due to relativity.

You would think we wouldn't be too far from being able to launch a unmanned probe capable of such a trip.

no, we aren't remotely close to sending an unmanned probe anywhere near the speed of light.

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#### Ben90

##### Platinum Member
If you travel for 5 years at 1g, you would be 5 time the speed of light.
While they appear to on Earth, velocities just don't just strait add up. It's possible to accelerate forever at 1G and you will never break the speed of light.

#### randomrogue

##### Diamond Member
The space shuttle not an option any longer (17,500 mph @ 498,000 years) but we could send a Soyuz capsule lol,

#### Red Squirrel

##### No Lifer
Maybe we're actually seeing our own planet, but the transformation of the area around it and physical movement happened faster than light so we are seeing a "lagged" version of it. :biggrin:

#### meob

##### Member
Compared to manned exploration using constant acceleration a probe would be easy. Half of the problem is building everything on earth and wasting so much effort getting it into space. We need a colony in the moon already.

http://math.ucr.edu/home/baez/physics/Relativity/SR/rocket.html

You are confusing the experienced time of the rocket and the observed time of people on earth.

how would we accelerate a probe any more than a manned vehicle to even a fraction of the speed of light?

#### Lanyap

##### Elite Member
Been there, done that. Yes, aliens exist.

#### silverpig

##### Lifer
No need to go faster than light.

13 light years away would only take a ship a little over 5 years travel time with 1g constant acceleration half the way there and 1g deceleration for the latter half.

Although on earth it would appear to take almost 14 years to get there due to relativity.

You would think we wouldn't be too far from being able to launch a unmanned probe capable of such a trip.

The fuel required for 1g acceleration for 5 years is enormous.

#### silverpig

##### Lifer
Compared to manned exploration using constant acceleration a probe would be easy. Half of the problem is building everything on earth and wasting so much effort getting it into space. We need a colony in the moon already.

http://math.ucr.edu/home/baez/physics/Relativity/SR/rocket.html

You are confusing the experienced time of the rocket and the observed time of people on earth.

At the end of the day he's not entirely wrong though. After all, he did make a 13ly trip in ~5 years.

#### rsutoratosu

##### Platinum Member
we need warp signature !

#### coldmeat

##### Diamond Member
Compared to manned exploration using constant acceleration a probe would be easy. Half of the problem is building everything on earth and wasting so much effort getting it into space. We need a colony in the moon already.

Why aren't we working on a StarTram (http://en.wikipedia.org/wiki/StarTram) or something similar yet?

#### Exterous

Super Moderator
i wonder if their socialists

You wonder if their socialists what? Don't leave us hanging!

#### Fritzo

##### Lifer
If our space shuttle can travel 20k mph, how long will it take to get there?

Well, 13 light years is like 764204976000000000000 miles, so at 17000mph, it would take....a really long time?

#### iroast

##### Golden Member
its the pastafarian lost tribe!

the rigatonis!

Is that you, Russell?

#### John Connor

##### Lifer
If the planet did have intelligent life SETI sure as hell would have heard a broadcast from the planet by now.

#### Agent11

##### Diamond Member
how would we accelerate a probe any more than a manned vehicle to even a fraction of the speed of light?

All you need is a light enough probe, and an efficient enough means of propulsion.

Would need some sort of powerful magnetic shielding though, I wonder if you could design the shield to funnel charged particles to feed the engines? That would be a neat trick.

#### gevorg

##### Diamond Member
13 light years away? we can't even get to Mars which is just 0.00000076051 light years away from us!! (as in establish a base and have permanent human presence there)

#### Agent11

##### Diamond Member
Thats just a lack of will though, we could easily be doing so already if we wanted to.

#### phucheneh

##### Diamond Member
This news is notsomuch news. We've suspected the existence of nearby habitable worlds for a while. It's just a probability thing.

The search has been on via the method they describe in the article, which it admits is a method that will only detect planets that are in the proper orbit.

...but they're still looking. Basically, it sounds like someone said 'well, we've been looking, and we've now deemed it more probable to be probable.'

Hooray? :hmm:

#### JTsyo

##### Lifer
All you need is a light enough probe, and an efficient enough means of propulsion.

Would need some sort of powerful magnetic shielding though, I wonder if you could design the shield to funnel charged particles to feed the engines? That would be a neat trick.

Saw this on Wired: Propellant-less space propulsion.

#### Fritzo

##### Lifer
no, we aren't remotely close to sending an unmanned probe anywhere near the speed of light.

The fastest man-made object so far was the Helios spacecraft from the 70's, which they discovered was orbiting at like 150,000mph (I remember this because the designers had no idea it would end up going that fast )

I think the fastest propelled object is the New Horizons spacecraft heading to Pluto right now, which is travelling in the 60000mph range.

We have designs for nuclear rockets and solar sails that could theoretically reach .06c to .10c, but the materials and technology to construct them aren't available yet. Craft travelling this fast would probably have to be unmanned, as anything colliding with it would shoot through the craft like a shotgun blast.