Starman’s Comments (group member since Feb 21, 2017)

Starman’s comments from the Astronomy and Space exploration group.

We have all heard of it , we have all seen it at some point this month , what did you y'all really think of the two commercial companies , launching their founders to the edge of the Atmosphere?

Vaishnavi wrote: "Hii , I am Vaishnavi and I love astrophysics, black holes and the paradoxes.
I wanted to join a group like this"

Welcome to the group Vaishnavi.

Hi Piers , Great to have you in the group , i have always wondered a lot about ethics issues of space exploration......good to have someone to discuss it with.

Also the accretion disc look kinds weird it looks bent and is perpendicular and looks like an arch.
This is because- Imagine you are looking at the hole straight in front of you
Accretion disc is actually a ring in a single Plane
But it appears like an arch because the light from the back of the disc is dragged towards the hole and gravity bends the light ray in your direction
This causes the ring at the back of the hole to appear perpendicular and like an arch

Now as you can see the accretion disc doesn't extend till the event horizon , it has a limit. it stops at a certain point.
Because if you know orbital mechanics , the more the force of gravity you have the more linear velocity you need to have to maintain the orbit.At the inner end of the accretion disc the gravitation becomes soo high that the matter cannot have the linear velocity to hold its orbit. So everything having mass beyond that inner edge of Accretion disc is unstable and ends up in the Hole

Okay . I will TRY

Now for reference keep in your mind the Black Hole in the movie Interstellar , it is pretty accurate(they have just exaggerated a little for more drama) , just google the image and keep it in your mind.

Now,you will see 2 rings in total .
ONE the Big ring LIKE structure which is thick and moving at insane speeds and really Bright That is Accretion Disc .
Accretion Disc Consists only of Matter moving at insane speeds and due to friction they become super hot and emit all sorts of radiation.

Thanks Arko . Good Video.

First of all the image is of a Supermassive Black Hole center of a Galaxy named as M87 which is almost 54 MILLION LIGHT YEARS AWAY.Scientists used many Radio telescopes and collected precise data and recreated a precise image using the data.

Coming to the Picture itself The Dark Space inside the light ring like structure is not immediately the Black hole. The Black Hole lies in the Center of that dark space.

Disappointed ? . I think one you understand the image you will no longer be disappointed

After all these years , after all the hype this last month .The National Science Foundation released the first ever Image of Black Hole.
Here is the Link to the Youtube Video of the Event.
https://www.youtube.com/watch?v=5G9GO...

Yes sure
1.Black Holes and Time warps

2.Death By a Black Hole


These Two Books are Very good Starters , will tell you the general essential details required.
For mathematical part it can become a little complicated , Assuming that you are familiar with a good level of Mathematics , a little graduate level These books go deep into the subject
1.Mathematical Theory of Black Holes

2.Gravitation

Hello Guys I am Done with the book , Anyone else?

Hello Ven If you want to read more about Quantum Mechanics i highly recommend this book, i started with it

Quantum By Manjit Kumar
it is a great read.

Well Ven , If there were Infinite no of Universes , there wouldn't be infinite YOU. But there would be infinite VERSIONS of you . But The problem with Infinite number of anything is the Probability gets Infinetly Complex . First of all there is a chance of you being born in another universe , and if we continue this chain , it is deadly complex.

Hello Chris , Yes This post talks about reaction involving alcoholic compounds in the Dust Clouds. It is very fascinating, Scientists were almost certain that these chemical reactions involving bond energies can never take place in those harsh temperatures but they couldn't explain the presence of many alcoholic compounds detected in most of the gas clouds.
Now the mystery is solved -Quantum Tunneling
I always find Quantum Tunneling a bit Weird yet such an interesting topic all thanks to wave nature of particles.

A weird quirk of quantum mechanics is allowing a chemical reaction thought to be impossible to occur in cold gas in outer space.

In the harsh environment of space, where the temperature is about minus 350 degrees Fahrenheit (minus 210 degrees Celsius), scientists had thought a certain reaction involving alcohol molecules couldn't take place, because at such low temperatures, there shouldn't be enough energy to rearrange chemical bonds. But surprisingly, research has shown that the reaction occurs at a rate 50 times greater in space than at room temperature.

Now, by simulating the conditions of space in a laboratory, scientists have found a possible explanation for how the reaction occurs: quantum tunneling.

Tunneling depends on the odd rules of quantum mechanics, which state that particles don't usually have decided states, positions and speeds, but exist in hazes of probability. This means that a particle might have a strong probability of being located on one side of a wall, but still retain a very small chance of actually being on the other side of it, allowing it, occasionally, to "tunnel" through a wall that would otherwise be an impassable barrier.

Hello Kim . Welcome to our group.

Thank you .

Thank you . I will put these books on my to-read list.

Hello Chris and Welcome to our group.And trust me a lot of us in this group share a similar story as yours . Looking forward to having a lot of discussions on Astrophysics

Thanks