Question

http://assets.openstudy.com/updates/attachments/570fcc45e4b0df36b96b5c3f-ganeshie8-1460653136280-zz.png

Answer 1

an armada of spaceships

Answer 2

armada means a group of warships sailing together

Answer 3

i know xD i got it

Answer 4

can you imagne a light year long warships

Answer 5

its length may be more than the diameter of the earth..

Answer 6

no i can't imagine it because i have no perception of how big that warship would have to be

Answer 7

a ship that can contain the entire population of the world, we need one of those for when the sun blows up in about 4 billion years

Answer 8

"1one light year"

is the distance

that light travels in one year

Answer 9

yeah i got that part too but that spaceship would have to be ginormous

Answer 10

i think they are group of small spaceships, not just one giant ship..

Answer 11

yes but they might be a group of giant ships

Answer 12

how do you know that earth will blow up ?

Answer 13

because the sun will swallow it

Answer 14

is sun like a balloon that somebody is pumping up to blow up in a billion years ha

Answer 15

no because its a star and stars will age xD

Answer 16

when they age, they indeed blow up to giant sizes before they die

Answer 17

yeah and then becomes a white dwarf

Answer 18

when they use up all of the core thing nitrogen i think

Answer 19

those spaceships can probably carry an entire galaxy

Answer 20

you know a lot
before becoming a white dwarf, they go through another phase called "red giant"

if you're on earth and immune to sun radiation, then you will see the giant sun a few meters away from the earth!

Answer 21

670,616,629 mph is how far light goes, so lets say light goes 670 million miles in one hour and then we have a year xD

Answer 22

exactly

Answer 23

yup in a couple million years it'll be red giant

Answer 24

life span of a human is about 80 years so we got like a good like 800 thousand life times for this

Answer 25

you can touch the red giant by jumping on your feet from a tall building

Answer 26

yes but we would be dead unless technology will have somehow evolved for us to be immune to that, which i don't doubt, because we have like a couple million years

Answer 27

i wouldn't doubt that we would be in another galaxy by then

Answer 28

intergalactic travel would probably be possible, i mean at first we didn't even know what rocks were probably, and now technology is evolving so much

Answer 29

earth will die far before the sun becomes a red giant
we don't really need to wait a million years haha

Answer 30

yes but we can just go to another solar system or galaxy

Answer 31

yeah unless we can somehow prevent the earth's demise xD planting trees isn't gonna work

Answer 32

yea there must be plenty of earth like planets out there
if only our spacehips could travel at 90% the speed of light..

Answer 33

do you watch movies

Answer 34

absolutely not

Answer 35

i mean do you watch a lot of scifi movies

Answer 36

jk i watch movies xD, but not intergalactic ones

Answer 37

do u like scifi?

Answer 38

we will probably develop alot more technology for space in the next couple hundred years because that is like the next thing that we are interested in exploring,

Answer 39

i don't have a particular preference
i watch all good movies

Answer 40

did u watch the revenant xD leonardo di caprio

Answer 41

nope i watched other two oscar movies
ex machina and some other movie

hows revenant ?

Answer 42

its so good xD this guy is sleeping in dead horses

Answer 43

i wanna live forever

Answer 44

im gonna watch it soon
the other movie is mad max fury road. hbo has been playing mad max fury road for the past 4 months or so...

Answer 45

who doesn't
wat will you do by living forever tho

Answer 46

oh i like alot of action movies like war/crime

Answer 47

i will explore as much of the galaxy as i can before it keeps FREAKIN EXPANDING

Answer 48

well i mean its still gonna expand but ill invent this super fast ship

Answer 49

if you could invent that super fast ship, you don't need to live forever
just travel to whatever time in future you want in that ship

Answer 50

oh yeah, but ill need to live long enough to invent it

Answer 51

i don't think our knowledge of physics is complete enough for time travel

Answer 52

special relativity allows future travel
we don't know whether past travel is possible yet

Answer 53

the mission impossible movies were so good

Answer 54

well has anyone tried future travel xD

Answer 55

we need spaceships that go at huge speeds to travel into future

Answer 56

oh yeah, like the one i will invent in about one thousand and oney one years

Answer 57

the problem is you can't come back to the past that you have left

Answer 58

oh dang

Answer 59

no because if i travel to the future and the future has past travel

Answer 60

you will keep on going into future w/p any hope of returning back to ur original present

Answer 61

thats impossible, einstein asked this question :

if past time travel were possible, where are all the time travellers ?

Answer 62

they chose not to reveal themselves

Answer 63

have u read that one series of books, like lemme check

Answer 64

why would you choose not to reveal if you are doctor who

Answer 65

Margaret Peterson Haddix

Answer 66

the series is called "the missing"

Answer 67

well in the books they have like tools that can make them invisible, etc

Answer 68

i recommend reading it xD

Answer 69

this
https://www.goodreads.com/series/45802-the-missing
?

Answer 70

yup

Answer 71

OMG I HAVENT READ REDEEMED YET WHAT THE HECK

Answer 72

looks interesting, il keep this in my fav list

Answer 73

ye :) u could prob get them at library

Answer 74

its about children in history, basically famous children from history got taken by time travelers from the future to sell in the future and then they crash land in the present time and they like time travel and stuff its really good

Answer 75

Supposedly Godel found a solution to the Einstein field equations that allows time travel, but they are like possibly not physically real.

Answer 76

well we talk about this now, it'll be a different conversation in a couple thousand years, they will be like, todays field trip is riding dinosaurs! Everybody hop in!

Answer 77

well maybe more than couple thousnad

Answer 78

i don't think future physics will be too much different... im sure einsteins physics is not going to disappear...

Answer 79

we never know

Answer 80

I'm actualy a time traveler =)

Answer 81

thats general relativity @Kainui ?
einstein field equations... do they allow true time travel ?

Answer 82

define time travel

Answer 83

im in freshman taking honors biology and we are talking about these physics things, LEARNING TIME

Answer 84

http://physics.stackexchange.com/questions/170635/g%C3%B6dels-solutions-to-einsteins-relativity-equations-and-their-consequences

Answer 85

http://www.iep.utm.edu/timetrav/

Answer 86

if you could travel a large interval of time in less time interval, then it is called future time travel

Answer 87

Time travel would be a closed path that starts at the point (t,x,y,z) and ends at (t,x,y,z) I think.

Answer 88

looks Godel is talking about a rotating universe, unfortunately we are in a different universe ?

Answer 89

future time travel is going from (t, x, y, z) to (t', x, y, z) of earth's coordinates in less than t'-t of your time

Answer 90

I thought it was unknown whether or not we were in a rotating universe, but I don't know I first read about this maybe a year ago so beats me. It seems impractical anyways since you still experience aging, but this specifically involves travelling essentially to the past not to the future.

Answer 91

so if it takes me 15 minutes to get to walmart, but i get there in 14 minutes than i am time traveling

Answer 92

something like that, but walmart must experience 15 minutes while you experience only 14 minutes

Answer 93

Oh interesting, can't wait to do general relativity... but i heard it is very hard and requires a lot of advanced math

Answer 94

i mean technically since nothing can travel faster than light, as they said, if we invent something that goes faster than we should be able to do that

Answer 95

i can't wait to do science thats not describing plants

Answer 96

I've not even studied special relativity, I've only studied tensors and the topology and manifold stuff. So I really don't know too much but I think since I sorta have the framework understood I will be able to figure it out faster than if I hadn't already studied this math.

Answer 97

technically, if you start now, you can travel the entire universe going at less than light speed before you even reach a legal age to marry

Answer 98

whens the legal age to marry