Black Holes Milky Way Galactic Centre in Infrared Wavelengths BH = 3.6 mill sun masses 26,000 ly away Stars here move 3 mill. miles per hour Real data 3-D Simulation based on real data

Black Holes What if the Sun became a black hole? It couldn’t, but if it did, we’d feel exactly the same amount of gravity as we do now. We’d continue to orbit as per usual. Stellar mass black holes aren’t a problem unless you are within a few km of it. Supermassive black holes do gobble up stars though. But they are at the centre of galaxies only, far from us!

Black Holes What if you fall into a black hole? You are doomed Gravity 1000 times stronger on feet than head Spaghettification Dead in a few milliseconds Inside event horizon, can’t ever escape (v esc = c)‏ Matter collapses down to a point, a singularity

Black Holes Schwarzschild Radius Math for high school kids: Escape velocity is the speed needed to escape the gravity of an object. v esc = (2GM/R) 1/2 where G=6.67x m 3 /kgs 2 The Schwarzschild Radius (event horizon) is where the escape velocity = the speed of light. So the radius can be calculated: R = 2GM/c 2 where c=300,000km/s YOU want to be a black hole?... Now you can calculate your future size!

Black Holes Inevitable Mathematics Scientists believe that if an object reaches the Schwarzschild radius, the object will inevitably be pulled into the black hole. Some mathematical expressions and operations result in a numerical black hole no matter where you start…

Black Holes Inevitable Mathematics Divide by 3 Subtract twice the original number Add 12 to the result Multiply it by 6 75 Start with a Number (positive integer)‏ Math for anyone:

Black Holes Foil, Balloons and Black Holes An activity that helps students understand the concept of density In a black hole, all matter collapses down into a point, a singularity, which is beyond our ability to understand

Black Holes Foil, Balloons and Black Holes

Black Holes

The families of matter travelled through space and moved freely from one place to another. Everything was fine until they came too close to each other…

Black Holes

NASA and other space agencies are using telescopes, like Fermi, to study the universe in different wavelengths. They hope to learn more about active galaxies, the supermassive black holes at their centres and, in general, “searching for unseen physics in the stars of the galaxies.” In Summary…

Black Holes For More Information: How to contact me: ( )‏ Information: Cosmic Survey Activity: see my webpage above GLAST Black Holes 2/black_holes.html 2/black_holes.html Teacher Materials c.html c.html