On A Daily Basis?  That's A Good Question, Because When You Think Of People That Might Be Dressed In

“So, I’m a theoretical physicist, so frankly I haven’t discovered anything in my life, but I have made a handful of predictions.  One of those having to do with black holes is-has to do with the way the light gets bent by the black hole–the extreme gravity of the black hole–so you can get light bouncing back and forth across an accretion disk due to the extreme gravity of the black hole. 

NASA is actually working right now on building a new x-ray telescope that can measure this effect, the extreme light bending by the black hole.  So hopefully in the next few years we will be able to make that discovery and prove that prediction correct.”

What is the most interesting fact that you discovered about Black Holes? And what is the one you would most want to find out?

"So a black hole is just pure gravity.  In technical terms, that means that Einstein taught us that gravity is energy.  Energy is mass (E = mc2) .

Mass creates more gravity, so you get this essentially runaway effect where gravity is causing energy is causing mass is causing more gravity.

And it just pulls itself in on itself more and more and more, and you get this runaway called a singularity surrounded by an event horizon, which is the black hole."

uhmm, can you tell me what exactly a black hole is? or what iy does? thanks, just really confused and curious on how it actually works.

"So, one of the really cool things about black holes that I've been working on recently is using black holes to study another aspect of astrophysics which we don't really understand called dark matter.  Dark matter pervades the entire universe. It's probably five, six times more populous than regular matter, and yet we still have no idea what this stuff is.

The only thing we know about dark matter is that it reacts to gravity.  And if you really want to push gravity to the extreme, of course the way to do it is with a black hole.  So we're trying to understand how dark matter and black holes interact together."

What is the most fascinating thing about black hole research for you, personally?

Yeah, flying's great.  It's a completely different sensation.  You know, you can compare parts of it to things like riding a bicycle, skateboarding, surfing, things like that - even skydiving.  It's a real feeling of freedom when you're actually controlling *makes wing gestures* the aircraft flying through the air - a little bit like a bird. 

And that's an amazing privilege to have, and it's really a nice opportunity to get up there and maneuver in three dimensions - really four dimensions if you consider speed - through the earth's atmosphere.  I absolutely love it.

How does flying feel?

“So, if the sun were just an isolated black hole with nothing around it, we would see nothing.  If we knew exactly where to look–which we would, because we’re pretty good astronomers–and we could map out the solar system, we’d know there’s something in the middle of the solar system that’s causing all of the gravity and the orbits of the planets.  If we looked right at that, we’d actually see some really cool gravitational lensing effects, and you’d see these arcs of light around the invisible black hole called the Einstein ring.”

What do *you* think is inside a black hole? Or If they sun was a black hole what would we see in the sky? Thanks!

In my 28 years here, I've been able to participate in a lot of exciting missions, but out of all of the future missions we have planned the one I'm looking forward to the most is being a part of boots on the moon in 2024.

What future missions are you looking forward to the most?

So on the ISS we have a wake-up time.  There's not really any predetermined time because we're orbiting the Earth every ninety minutes.  But you have to pick a time scale, so we actually picked GMT, which is close to London time.

So we wake up, we have a normal conference call with the ground, we talk about things that are going on the space station, what we're going to do that day, and then we have a plan that tells us what we're going to do down to every five minutes on board.  And so it depends on the day.  

A lot of time we're doing science experiments, sometimes we're doing maintenance on the space station, sometimes we're even getting ready to do a space walk.  Those are the best days.  But every day is something new and different up there.

What does a normal day for you consist of?

"So the way we understand that black holes form is when a massive star basically runs out of fuel and collapses in on itself.  And the reason that happens is because, the reason stars don't collapse in on themselves on a regular day is because they're hot.  

Hot gas has pressure, so you have all this gas pushing out, you have gravity pulling in and you get a nice balanced equilibrium.  But eventually you run out of fuel, so you run out of temperature, you run out of pressure, and the gravity wins.  So the gravity just pulls in and there's not enough hot gas to hold it up anymore.  

That's how they form.  How do they move?  They move pretty much like every other star in the galaxy.  Mostly orbiting around, for example in the solar system, orbiting around the center of the galaxy with a little bit of random motions here and there."

How do blackholes form and how do they move ?

Over my 28 years here, I've had the opportunity to work a number of different critical missions at NASA, particularly as a flight director.  And each one of those missions has been an amazing honor to have the public's trust put in my hands.  

But one of the aspects I like the most about it, which is also the scariest, is the fact that people's lives are in my hands.  Decisions that I make can impact the lives of the crew members, the integrity of the vehicle, and the success of the mission, and I liked having that responsibility.  I was honored to have that responsibility.

And I think if you are a flight director and you ever lose track of that, then it's time to stop being a flight director.

Before my question I would like to congratulate you on your career at Nasa, it must be amazing to work there even if you didn’t achieve your dream of being an astronaut, you can still lead missions from the ground. (Sorry if my punctuation is a bit off) as for my question, what has it been like to work at nasa all of these years and get to help with so many missions? Do you ever get nervous for the people who’s lives are in your hands? Signed ~ Phillip

Hi, I'm Dean Neeley.  I go by "Gucci".  I"m the deputy chief pilot at Armstrong Flight Research Center.  And I'm excited to be here and answer some questions to everybody who's calling in through tumblr here.  This is a great opportunity to share with you.

It’s kick-off time! Pilot Dean “Gucci” Neeley is reporting for duty with answers to your questions in today’s Tumblr Answer Time!