vs: rockets

Yes, sure its fun to see a lady spin around like that, but I had one of my friends ask me - “Where do you even use this mate?”

Here’s one application that I know very well off.

Spin Stabilization

If you have ever seen a rocket launch, you might know that sometimes the rockets are given a spin while launching. This is known as spin stabilization.

Basically, the rotational inertia of the rotating body will stabilize the rocket against any disturbances and help maintain its intended heading.

The same principle is used in rifling of firearms as well. **

YoYo DeSpin

Okay, now there is the question how to “De-spin” the rocket:

Well, you do what the lady does: stretch out your arms and you will slow down !

The rocket has weights connected to a cable that stretch out and almost immediately the rocket slows down. This maneuver is known as the YoYo DeSpin. ( Damn good name ! )

All thanks to the conservation of angular momentum !

Have a good one !

* Another method to stabilization : 3-axis stabilization

** Bullets spin stabilization - post

** Source rocket launch video

Sounding Rocket Science in the Arctic

We sent three suborbital sounding rockets right into the auroras above Alaska on the evening of March 1 local time from the Poker Flat Research Range north of Fairbanks, Alaska.  

Sounding rockets are suborbital rockets that fly up in an arc and immediately come back down, with a total flight time around 20 minutes. 

Though these rockets don’t fly fast enough to get into orbit around Earth, they still give us valuable information about the sun, space, and even Earth itself. Sounding rockets’ low-cost access to space is also ideal for testing instruments for future satellite missions.

Sounding rockets fly above most of Earth’s atmosphere, allowing them to see certain types of light – like extreme ultraviolet and X-rays – that don’t make it all the way to the ground because they are absorbed by the atmosphere. These kinds of light give us a unique view of the sun and processes in space.

The sun seen in extreme ultraviolet light by the Solar Dynamics Observatory satellite.

Of these three rockets, two were part of the Neutral Jets in Auroral Arcs mission, collecting data on winds influenced by the electric fields related to auroras. Sounding rockets are the perfect vehicle for this type of study, since they can fly directly through auroras – which exist in a region of Earth’s upper atmosphere too high for scientific balloons, but too low for satellites.

The third rocket that launched on March 1 was part of the ISINGLASS mission (short for Ionospheric Structuring: In Situ and Ground-based Low Altitude Studies). ISINGLASS included two rockets designed to launch into two different types of auroras in order to collect detailed data on their structure, with the hope of better understanding the processes that create auroras. The initial ISINGLASS rocket launched a few weeks earlier, on Feb. 22, also from the Poker Flat Research Range in Alaska.

Auroras are caused when charged particles trapped in Earth’s vast magnetic field are sent raining down into the atmosphere, usually triggered by events on the sun that propagate out into space. 

Team members at the range had to wait until conditions were just right until they could launch – including winds, weather, and science conditions. Since these rockets were studying aurora, that means they had to wait until the sky was lit up with the Northern Lights.

Regions near the North and South Pole are best for studying the aurora, because the shape of Earth’s magnetic field naturally funnels aurora-causing particles near the poles. 

But launching sensitive instruments near the Arctic Circle in the winter has its own unique challenges. For example, rockets have to be insulated with foam or blankets every time they’re taken outside – including while on the launch pad – because of the extremely low temperatures.

For more information on sounding rockets, visit www.nasa.gov/soundingrockets.

Make sure to follow us on Tumblr for your regular dose of space: http://nasa.tumblr.com

The camera obscura was an important scientific discovery back in ancient times. It helped us understand that light travels in straight lines, as eloquently demonstrated by 11th-century Arab scientist Alhazen. He discovered that a single ray of light beaming through a tent produced an inverted image of the scene outside.

You can recreate the revolutionary experiment yourself with a window, some cardboard, and a hole-poking device of your choice. We recommend a trident, as we always do.

Slap some cardboard slabs over the window and cover all other light sources, then jab a hole in the cardboard (you can make it smoother or rougher to adjust resolution):

Wait for your eyes to adjust and enjoy the free acid trip. Your room is now a rudimentary camera, generating an inverted image of the scary world outside. It’s reversed because the light beams reflecting from higher objects like trees or buildings travel down diagonally through the makeshift lens, and vice versa for objects down below.

Do You Want To Set Your Hand On Fire? 6 Fun Science Tricks


That Close Call Back in 1995 — The Norwegian Black Brant Incident,

In the past 60 years there have actually been several incidents where the world was almost plunged into a nuclear holocaust.  Many of these incidents were purely accidental, caused by things like radar blips resulting from flocks of geese or faulty early warning detection satellites. One of the most interesting close calls occurred in Norway, and is unique in that the incident happened in 1995, after the end of the Cold War.

On January 25th, 1995 a team of Norwegian and American scientists launched the Black Brant VII rocket from the Andøya Space Center in Norway. The purpose of the rocket was to collect scientific data on the aurora borealis over the Arctic Ocean. The rocket reached an altitude of 903 miles and eventually splashed down in the ocean off the coast of Svalbard. At the time most of the world believed the rocket launch was a routine test that occurred without incident. However, little did anyone know, the Russians nearly shit their pants over it.

The rocket traveled over an air corridor that stretches from minuteman III rocket sites in North Dakota. The scientists notified 30 countries, including Russia, of the launch, however the Russian government failed to pass on news of the launch to the Russian President and to the military. Russian early warning radar systems in Murmansk detected the object, which had a similar speed and flight pattern to that of a US Navy Trident missile. Immediately Russian High Command went on full alert, fearing the United States was launching a nuclear missile. While a single missile launch may not seem much of a threat compared to thousands of missiles in an all out nuclear strike, one possible scenario that the Russians feared was that of a high altitude nuclear detonation used as a prelude to all out nuclear war. A nuclear warhead would be detonated high in the atmosphere over Russia, and the resulting electromagnetic pulse would knock out the electrical grid, communications grid, and radar over a large portion of the country, leaving Russia completely vulnerable to an all out attack.

The full alert initiated by the rocket launch went all the way up to Russian President Boris Yeltsin. The Russian nuclear briefcase containing command codes was opened, the only time in history a nation’s nuclear briefcase was ever opened. This was especially scary because Boris Yeltsin had a reputation for being a hard drinker. Yeltsin’s alcohol problems were so bad that he was often drunk in public, at one point allegedly being found wandering the streets of Washington D.C. half naked after a particularly hard bender during a diplomatic visit.

As luck would have it, Boris Yeltsin was perfectly sober on January 25th, 1995, and thus he made a very wise decision to not retaliate but take a wait and see approach. Soon, it was realized that the rocket was traveling away from, not towards Russia, and thus was not a ballistic missile being fired at Russia. 24 minutes after launch, the rocket returned to Earth harmlessly. Disaster had been averted once again.

What is especially disturbing about the Norwegian rocket incident was that it occurred in the 1990′s at a time when Russian - American relations were at a peak. This wasn’t the middle of the Cold War, this wasn’t the Cuban Missile Crises with Nikita Khrushchev shouting “we will bury you!” while slamming his shoe on a podium. This was at at time when there was absolutely no reason to go to nuclear war. It just goes to show that in the modern nuclear age, even at the best of times civilization hangs on a very fine thread. 


When I post Slow Mo Guys videos, it often comes with a warning not to try this at home. For their latest video, that deserves an extra-special mention: seriously, don’t try this. In this video, Dan and Gav explode lithium-ion batteries. In the process, they discover a safety feature - namely vents on one face of the battery. Because runaway thermal reactions (a.k.a. explosions) are a possibility with this type of battery system, consumer-grade batteries are designed to try and prevent extreme damage. One of these outwardly visible safety features are these four vents that release gas when when the battery is too hot. By venting the gas, manufacturers keep the battery from exploding and sending hot chemicals and shrapnel in all directions. Instead the venting gas turns the entire battery into a miniature rocket. (Video and image credit: The Slow Mo Guys)