Anyone with good knowledge of physics/astrophysics?

[Vim]

Awhile ago I came across a Star Comparison Chart and it's been lying around my random picture archive for a bit. More recently I saw a couple of Astrophysics documentaries, one which had as main interviewee the now well known Neil DeGrasse Tyson.

Shit got me thinking, but before I divulge more, I'll show you these pictures I've been thinking about for awhile.

[Vim]

Continued...

[Vim]

The main question that has been going through my mind about these is that, if by some miraculous miracle in gravity/magnetic fields, if the earth was the size of most or more importantly the size of the biggest star in the pictures... How big would it be? And how would that in turn affect the outcome of life as we know it?

I wish I had some relative idea of physics or astrophysics to make some calculations of travel on the "huge earth" but I dont, so thats why I post these here. And I care to know what ya'll think about these. Personally, they make me flip out.

EDIT: Pretty sure they are all to scale.

[Mcpickle Deluxe]

I'm assuming that the gravity on that biggest star is vastly larger than our own? So, instead of being able to jump around like people can on the moon, we would most likely be squashed by its gravity?

Dunno.

[Vim]

Originally Posted by Vim

The main question that has been going through my mind about these is that, if by some miraculous miracle in gravity/magnetic fields, if the earth was the size of most or more importantly the size of the biggest star in the pictures... How big would it be? And how would that in turn affect the outcome of life as we know it?

rawr! I assume you know theres a lot of things in our universe that can't be explained, use that!

[Tuco]

How big would it be?

Are you asking how big VV Cephei is?

From wiki:

The diameter of the Sun is 1.392×109 meters, or 864,900 miles.
VV Cephei is 1600-1900 diameters of the sun. So multiply 1750 times 864,900 miles and you have the diameter of vv cephei. Is that what you wanted?

[Ionsniper]

Nah hes asking what would it be like to live on a planet like Earth the size of that star. Assuming the gravity was close to our own. Its be interesting thats for sure. Im sure there would be civilizations we havent discovered yet living on the other side of the planet if it was that big. That is a HUGE star.

[Shanter]

I think what he's trying to get around to if life conditions were possible, what would the Earth be like if it was the size of the largest star (correct me if I'm wrong)?

Put it this way, you could have dozens of intelligent lifeforms (by intelligent I mean having the ability to make decisions not based on animal instincts) that could live for thousands of years and never meet.

[Al Capwn]

Which leads me to a question I've wondered for years.... How the fuck can people rationalize that the Earth is flat?? /boggle

[Dr. Funkenstein]

The Death Star is real!?!?

[Dr. Funkenstein]

Originally Posted by Al Capwn

Which leads me to a question I've wondered for years.... How the fuck can people rationalize that the Earth is flat?? /boggle

Ummm...that's easy. Naked experience on the ground tells us it's flat. No matter how far you walk, you're always standing upright. Naked experience also tells us that the sun and stars move around the earth.

It really didn't take long for people who cared to find out that the earth wasn't flat, and that it moved around the sun (along with several other planets) it simply took a long time to convince people that didn't care of those facts.

And, really, it still doesn't much effect your everyday decision making. It's just something interesting you learned in school/on the internet/on television.

[tjac]

Originally Posted by Vim

The main question that has been going through my mind about these is that, if by some miraculous miracle in gravity/magnetic fields, if the earth was the size of most or more importantly the size of the biggest star in the pictures... How big would it be? And how would that in turn affect the outcome of life as we know it?

I'm kinda talking out my ass, but I think at a certain point the physics of large mass prevent planets made of earth-like materials (iron, oxygen, and silicon) from forming.

[Dr. Funkenstein]

Wikipedia strikes again!

If it were possible for a human to walk on the surface of Canis Majoris, at 3 miles an hour for 8 hours a day, it would take him 650,000 years to walk the entire circumference (compared with 2 years 11 months to complete the same task on the Earth, and 310 years 7 months on the Sun).

There ya go.

[dorinn]

on the Earth is flat deal, the school of thought in the Scholar community at the time was that everything certain Greek philosophers said was correct and Aristotle said the earth was flat and so it was. It´s quite likely that Seamen would have know that the earth is round or at least not completely flat.

[Dr. Funkenstein]

Okay, dorinn...you're a bit wrong there: Spherical Earth - Wikipedia, the free encyclopedia

Aristotle (384 BCE - 322 BCE) was Plato's prize student and "the mind of the school." Aristotle observed "there are stars seen in Egypt and [...] Cyprus which are not seen in the northerly regions." Since this could only happen on a curved surface, he too believed Earth was a sphere "of no great size, for otherwise the effect of so slight a change of place would not be quickly apparent.

...and everyone's usually wrong here: Flat Earth mythology - Wikipedia, the free encyclopedia

As is expressed by Stephen Jay Gould, "there never was a period of “flat earth darkness” among scholars (regardless of how many uneducated people may have conceptualized our planet both then and now). Greek knowledge of sphericity never faded, and all major medieval scholars accepted the earth’s roundness as an established fact of cosmology.[1] David Lindberg and Ronald Numbers also write: "there was scarcely a Christian scholar of the Middle Ages who did not acknowledge [Earth's] sphericity and even know its approximate circumference."[2]