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spaceplasma:

Millisecond Pulsars

As the name suggestions, millisecond pulsars have pulse periods that are in the range from one to ten milliseconds. Most such millisecond pulsars are found in binary systems, typically with white-dwarf companions. These pulsars are highly magnetized, old neutron stars in binary systems which have been spun up to high rotational frequencies by accumulating mass and angular momentum from a companion star. Neutron stars form when a massive star explodes at the end of its life and leaves behind a super-dense, spinning ball of neutrons. A pulsar is the same thing as a neutron star, but with one added feature. Pulsars emit lighthouse-like beams of x-ray and radio waves that rapidly sweep through space as the object spins on its axis. Most pulsars rotate just a few times per second, but some spin hundreds of times faster. These millisecond pulsars are the fastest-rotating stars we know of.

  • To hear the sound of a pulsar, click here

Credit: NASA

whitmerule:

uglv:

Beagle puppy barking for the first time. “I…don’t know how to express my feelings!”

YOU SHOULD SEE MY FUCKIGN FACE LIL PUPPY UR SO CUTE MLOVE MER

I WILL FALL OVER SIDEWAYS THAT WILL FIX IT

I don’t normally watch or reblog video/audio posts. This was more than worth it.

(Source: youtube.com)

doctorwho:


Today is the first day of the Doctor Who World Tour, it’s a chance for fans and the press to get to meet Peter Capaldi and Jenna Coleman and Steven Moffat, and talk over what is about to happen in Season Eight, including the world premiere of the first episode, “Deep Breath.”
To celebrate the occasion, which began in Cardiff earlier today, and to prepare London travelers for the imminent arrival of the new season on August 23, Transport For London have devoted one of their passenger information boards in the Underground to a very familiar image indeed. [x]

And it’s not the first time! 
(Thanks to Talia Kraines, lifeofatidball, and @RoxaneGrantArt for the images)
Zoom Info

doctorwho:

Today is the first day of the Doctor Who World Tour, it’s a chance for fans and the press to get to meet Peter Capaldi and Jenna Coleman and Steven Moffat, and talk over what is about to happen in Season Eight, including the world premiere of the first episode, “Deep Breath.”

To celebrate the occasion, which began in Cardiff earlier today, and to prepare London travelers for the imminent arrival of the new season on August 23, Transport For London have devoted one of their passenger information boards in the Underground to a very familiar image indeed. [x]

And it’s not the first time! 

(Thanks to Talia Kraines, lifeofatidball, and @RoxaneGrantArt for the images)

saulofortz:

 
The Brachistochrone
This animation is about one of the most significant problems in the history of mathematics: The Brachistochrone Challenge:

If a ball is to roll down a ramp which connects two points, what must be the shape of the ramp’s curve be, such that the descent time is a minimum?

Intuition says that it should be a straight line. That would minimize the distance, but the minimum time happens when the ramp curve is the one shown: a cycloid.

Johann Bernoulli posed the problem to the mathematicians of Europe in 1696, and ultimately, several found the solution. However, a new branch of mathematics,Calculus of Variations, had to be invented to deal with such problems. Today, calculus of variations is vital in Quantum Mechanics and other fields.
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