What Does it Take to Be an Astronaut?

What Does it Take to Be an Astronaut?

What does it take to have the “Right Stuff” to become an Astronaut?

Are you an overachiever? Are you working on multiple PhDs in obscure and difficult topics? Can you speak multiple languages, including alienese? Do you suspect, if handed the controls, you could complete the Kessel Run in fewer parsecs than Han Solo?

If you said yes to any of these questions you might want to consider becoming an astronaut. In fact, if you’re an American citizen, there’s never been a better time to see if you’ve got the right stuff. NASA has opened up their astronaut corps to the few, the proud, the willing to get motion sickness in zero gravity. To boldly vomit where few have vomited before.

In the olden days, you either had to be a chimpanzee or an Air Force test pilot to be allowed to take the controls of a genuine NASA rocket and break free from the surly chains of gravity. When NASA finally upgraded its astronaut corps from chimps to humans in the 1950s to begin the Mercury program, they decided they’d only allow test pilots to apply for the first missions.

To fit in the cramped cabin, you had to physically be no taller than 180 cm (5’ 11”), and weigh no more than 82 kg (180 pounds). You needed to have book smarts, too. Astronaut candidates needed at least a bachelor’s degree or the equivalent, but still be under 40 years old. But most importantly, you had to be a test pilot with at least 1,500 hours of flying time and the ability to fly jets.

If you didn’t have hours behind the stick, piloting the most insane flying machines dreamt up by those nutty scientists, well then you didn’t have the right stuff.

Those qualifications continued through the Gemini and Apollo program, although, they relaxed them somewhat, allowing younger astronauts, and those with less flight time. In the recruitment of astronauts in 1965, they allowed a new class of scientist-astronauts; folks with science degrees and no flight time. The most famous of these was Jack Schmitt, a geologist who walked on the Moon with Apollo 17.

NASA now understands that they need astronauts with a wide range of space-based skills, and not just a bunch of test pilots. There are two kinds of people who get to go to space: pilots and mission specialists.

STS-134 commander Mark Kelly strides across the runway of the Shuttle Landing Facility. Credit: Michael Deep, for Universe Today.
STS-134 commander Mark Kelly strides across the runway of the Shuttle Landing Facility. Credit: Michael Deep, for Universe Today.

The first category are the commanders and pilot astronauts – the folks who actually fly the spacecraft. They’re the ones with thousands of hours behind the stick of a modern jet, the more cockamamie the better.

To be qualified as a pilot astronaut, you need to have at least 1,000 hours of pilot-in-command time in a jet aircraft. You need to be healthy, with normal blood pressure, good vision and a height between 158 – 191 cm (62 and 75 inches). There are no longer any age restrictions, so astronauts have been selected between 26 and 46 years old.

You need a degree in some kind of space-related science, like engineering, mathematics, biological science and physical science. But that’s a minimum. You really want to have an advanced degree, or even multiple degrees. So, if you’re a healthy, eagle-eyed test pilot with a few advanced degrees, you should apply.

The other category is the mission specialists. These are the astronauts with specialties that will come into play on a space mission. For example: doctors, engineers, particle physicists, xenobiologists, alien translators, droid mechanics, etc. Since you won’t be required to fly the spacecraft, test pilot experience isn’t necessary, but you’ll need to have the same physical health as the pilot astronaut.

Nicole Stott, STS-133 mission specialist, is pictured in the Cupola of the International Space Station. Credit: NASA
Nicole Stott, STS-133 mission specialist, is pictured in the Cupola of the International Space Station. Credit: NASA

The main difference is that you’ll need to have one or multiple advanced degrees in engineering, science or math. The more degrees, and the more advanced they are, the better. Gotta collect them all.

I mentioned two kinds of astronauts, but there’s actually a third – the payload specialist. These were the astronauts who went to space during the shuttle era to support a specific mission. Priority was given to qualified NASA astronauts, but this was also how foreign astronauts like Canada’s Marc Garneau got a chance to fly in space.

Are you intrigued and thinking you might want to throw your name in the helmet? Want to know what being an astronaut pays? A starting astronaut can make $66,000 per year, while a senior one can earn $145,000 per year. Not bad at all, and the view from your office is spectacular.

So, if you’re a US citizen, you meet the qualifications, and you’d like to fly to space, you should apply during this latest call for candidates. And if you don’t think you make the cut, go ahead and wrap up those PhDs, as there’ll be another astronaut selection in a few years.

And if you do apply and don’t make the cut this time around, don’t despair. From the astronauts I’ve talked to, sometimes it takes a few applications before you get accepted. Persistence pays off.

Well, are you going to sign up and become an astronaut? Where do you think your mission will go? Tell us in the comments below.

Pre-Order “Treasures of the Universe” Astrophotography Book Through Kickstarter

Treasures of the Universe by André van der Hoeven
Treasures of the Universe by André van der Hoeven

We’ve featured the photography of André van der Hoeven here many times, and all of his photos are wonderful. Well, now you can get them all in one big book, titled Treasures of the Universe.

This 150+ page book contains photos of most of the major objects in the Solar System as well as deep sky objects, like galaxies, star clusters and nebulae. van der Hoeven provides many of the pictures in the book, and then fills out the rest with the highest quality photos from the Hubble Space Telescope, Spitzer, Subaru and many of the top observatories around the world. There are also great photos from rovers and spacecraft sent to distant worlds (including the latest pictures of Pluto from New Horizons). If you want a coffee table book with great images of space, it’s a great choice.

Treasures of the Universe by André van der Hoeven
Treasures of the Universe by André van der Hoeven

The book is currently being run as a Kickstarter, but unlike most campaigns, this book is complete and ready to go to the printers, so you’re really just deciding if you want a copy or not – a printed, signed copy or an electronic PDF.

At the time I’m writing this, there are just 5 days left in the Kickstarter, which is already fully funded. This project is already happening, but you can help André reach the stretch goal of 25,000 Euros.

The Kickstarter ends on Monday, November 30th at 3:00pm Pacific Time.

Why Do Red Dwarfs Live So Long?

Why Do Red Dwarfs Live So Long?

While our Sun will only survive for about 5 billion more years, smaller, cooler red dwarfs can last for trillions of years. What’s the secret to their longevity?

You might say our Sun will last a long time. And sure, another 5 billion years or so of main sequence existence does sound pretty long lived. But that’s nothing compared to the least massive stars out there, the red dwarfs.

These tiny stars can have just 1/12th the mass of the Sun, but instead of living for a paltry duration, they can last for trillions of years. What’s the secret to their longevity? Is it Botox?

To understand why red dwarfs have such long lifespans, we’ll need to take a look at main sequence stars first, and see how they’re different. If you could peel back the Sun like a grapefruit, you’d see juicy layers inside.

In the core, immense pressure and temperature from the mass of all that starstuff bears down and fuses atoms of hydrogen into helium, releasing gamma radiation.

Outside the core is the radiative zone, not hot enough for fusion. Instead, photons of energy generated in the core are emitted and absorbed countless times, taking a random journey to the outermost layer of the star.

And outside the radiative zone is the convective zone, where superheated globs of hot plasma float up to the surface, where they release their heat into space.

Then they cool down enough to sink back through the Sun and pick up more heat. Over time, helium builds up in the core. Eventually, this core runs out of hydrogen and it dies. Even though the core is only a fraction of the total mass of hydrogen in the Sun, there’s no mechanism to mix it in.

A red dwarf is fundamentally different than a main sequence star like the Sun. Because it has less mass, it has a core, and a convective zone, but no radiative zone. This makes all the difference.

Red dwarf convection. Credit: NASA
Red dwarf convection. Credit: NASA

The convective zone connects directly to the core of the red dwarf, the helium byproduct created by fusion is spread throughout the star. This convection brings fresh hydrogen into the core of the star where it can continue the fusion process.

By perfectly using all its hydrogen, the lowest mass red dwarf could sip away at its hydrogen fuel for 10 trillion years.

One of the biggest surprises in modern astronomy is just how many of these low mass red dwarf worlds have planets. And some of the most Earthlike worlds ever seen have been found around red dwarf stars. Planets with roughly the mass of Earth, orbiting within their star’s habitable zone, where liquid water could be present.

One of the biggest problems with red dwarfs is that they can be extremely variable. For example, 40% of a red dwarf’s surface could be covered with sunspots, decreasing the amount of radiation it produces, changing the size of its habitable zone.

Red Dwarf. Credit: NASA/JPL-Caltech
Red Dwarf. Credit: NASA/JPL-Caltech

Other red dwarfs produce powerful stellar flares that could scour a newly forming world of life. DG Canes Venaticorum recently generated a flare 10,000 times more powerful than anything ever seen from the Sun. Any life caught in the blast would have a very bad day.

Fortunately, red dwarfs only put out these powerful flares in the first billion years or so of their lives. After that, they settle down and provide a nice cozy environment for trillions of years. Long enough for life to prosper we hope.

In the distant future, some superintelligent species may figure out how to properly mix the hydrogen back into the Sun, removing the helium, if they do, they’ll add billions of years to the Sun’s life.

It seems like such a shame for the Sun to die with all that usable hydrogen sitting just a radiative zone away from fusion.

Have you got any ideas on how we could mix up the hydrogen in the Sun and remove the helium? Post your wild ideas in the comments!

Weekly Space Hangout – Nov. 20, 2015: Miguel Drake-McLaughlin, Director of Sky Line

Host: Fraser Cain (@fcain)

Special Guest: Miguel Drake-McLaughlin, Director of the new documentary, Sky Line, The Space Elevator Documentary. The film debuted at DOC NYC 2015 [Nov 12-19] – America’s largest documentary festival — and will be released on all major On Demand platforms on November 20th, 2015.

Guests:
Morgan Rehnberg (cosmicchatter.org / @MorganRehnberg )
Alessondra Springmann (@sondy)
Kimberly Cartier (@AstroKimCartier )
Continue reading “Weekly Space Hangout – Nov. 20, 2015: Miguel Drake-McLaughlin, Director of Sky Line”

Did We Need the Moon for Life?

Did We Need the Moon for Life?

Astronomers hate the Moon because it ruins perfectly good observing nights. But is it possible that we all need the Moon for our very existence?

For all we know, Earth is the only place in the Universe where life appeared. This makes the mystery of our existence even more puzzling. What were all the factors required to bring about the first lifeforms on our planet, and encourage the evolution of more complex, intelligent lifeforms.

We needed a calm and reasonable Sun, solid ground, nice temperatures, the appropriate chemicals, and liquid water. Possibly drinks served in pineapples with little umbrellas. But what about the Moon? Is the Moon a necessity for life in any way?

To the best of our knowledge, our Moon was formed when a Mars-sized object smashed into the Earth about 4.5 billion years ago. This enormous collision spun out a cloud of debris that coalesced into the Moon we know and love today.

Back then, the Moon was much closer to the Earth than it is today, a mere 20-30,000 kilometers. A fraction of its current distance. If you could have stood on the surface of the Earth, the Moon would have looked 10 to 20 times bigger than we see it today.

But nobody did, because the Earth was a molten ball of red hot magma, tasty lava through and through. Life emerged 3.8 billion years ago, pretty much the day after Earth had cooled down to the point that it was possible for life to form.

Scientists think that it first formed in the oceans, where there were adequate temperatures and abundant water as a solvent for life’s chemicals to mix.

The effect of gravity is a cube of its distance. When the Moon was closer, the power of its gravity to pull the Earth’s water around was more ferocious. But what impact has this gravity had on our world and its life? Do we need the Moon to make the magic happen?

Turns out, we might owe our very existence to it because its pull of gravity might have set our plate tectonics in motion. Without plate tectonics, our planet might be more like Venus, toasty and dead.

Map of the Earth showing fault lines (blue) and zones of volcanic activity (red). Credit: zmescience.com
Map of the Earth showing fault lines (blue) and zones of volcanic activity (red). Credit: zmescience.com

It raises the level of the world’s oceans towards the equator. Without this gravity, the oceans would redistribute, raising levels at the poles. It has also slowed Earth’s rotation on its axis. Shortly after its formation, the Earth turned once every 6 hours. Without that Moon to slow us down, we’d have much more severe weather.

It stabilizes the Earth’s rotation on its axis. It’s possible that the Earth might have rolled over on its axis on a regular basis, causing a complete redistribution of the Earth’s water. Astronomers think this happened on Mars, because it never had a large Moon to stabilize it.

But the biggest impact that the Moon has on life is through tides. That regular movement of water that exposes the land at the edge of the ocean, and then covers it again just a few hours later. This could have encouraged life to adapt and move from the oceans to land.

One of the most subtle effects from the Moon is what it has done to life itself. Nocturnal animals behave differently depending on where the Moon is in the sky during its 29.5-day cycle. When the Moon is full and bright, prey fish stay hidden in the reef, when they’d be most visible.

Prey fish in the reef. Credit: Laslo Ilyes
Prey fish in the reef. Credit: Laslo Ilyes

Amazingly, lions are less likely to hunt during the full Moon, and researchers have found that lion attacks on humans happen 10 days after the full Moon, and many bats will be less active during the full Moon.

With so many species on Earth affected by the Moon, it’s reasonable to think that there would have been a different evolutionary direction for life on Earth over the eons, and humans might never have evolved.

It looks like the Moon is important after all. Important to the geology of Earth, and important to the evolution of life itself.

As extrasolar planet hunters search for new worlds, and determine their viability for life, they might want to focus on the worlds with moons first.

What impact has the Moon had on your life? Post your anecdotes in the comments!

Astronomy Cast Ep. 393: The Standard Model – Leptons & Quarks

Physicists are getting a handle on the structure of the Universe, how everything is made of something else. Molecules are made of atoms, atoms are made of protons, neutrons and electrons, etc. Even smaller than that are the quarks and the leptons, which seem to be the basic building blocks of all matter.
Continue reading “Astronomy Cast Ep. 393: The Standard Model – Leptons & Quarks”

What is Tidal Locking?

What is Tidal Locking?

The Moon is tidally locked to the Earth, which means that it always shows one face to our planet. In fact, this is the case for most the large moons in the Solar System. What’s the process going on to make this happen?

Just look at the Moon, isn’t it beautiful? Take out a nice pair of binoculars, or a small telescope tonight and you’ll be able to see huge craters and ancient lava plains. Look again tomorrow, and you’ll be able to see… the exact same things. As you know, our modest Moon only shows us one face. Ever.

If you could look at the Moon orbiting the Earth from above, you’d see that it orbits once on its axis exactly as long as it takes to orbit once around our planet. It’s always turning, showing us exactly the same face. What’s it hiding?

The Moon isn’t the only place in the Solar System where this happens. All major moons of Jupiter and Saturn show the same face to their parent. Pluto and Charon are even stranger, the two worlds are locked, facing one another for all eternity. Astronomers call this tidal locking, and happens because of the gravitational interaction between worlds.

As you’re aware, the Moon is pulling at the Earth, causing the tides. In fact, the pull of the Moon is so strong that the ground itself rises up 30 cm, about a foot, as it passes by.

It’s even more powerful on the Moon. The gravity from the Earth distorts the Moon into an oblong shape. The sides pointed towards and away from the Earth bulge outward, while the others are pulled inward to compensate. It makes the Moon football shaped.

It’s no big deal now, but in the ancient past, shortly after its formation, the Moon was spinning rapidly. This meant that the part of the Moon bulged towards us was changing constantly, like water tides on Earth.

Vast amounts of rock need to shift and change shape to bulge towards the Earth and then settle down again, and this takes time. The position of the bulges on the Moon were always a little out of alignment with the pull of gravity of the Earth.

These bulges acted like handles that the Earth’s gravity could grab onto, and torque it back into place. Over time, the Earth’s gravity slowed down the rotation speed of the Moon until it stopped, forever.

Size comparison of all the Solar Systems moons. Credit: The Planetary Society
Size comparison of all the Solar Systems moons. Credit: The Planetary Society

This same process happened on all the large moons in the Solar System.
Because of its smaller mass, our Moon became tidally locked to the Earth billions of years ago. Now the process is continuing to make the Earth tidally locked to the Moon as well.

In the distant distant future, the Moon will stop moving in the sky, and hang motionless, visible from only half the Earth.

How distant? In about 50 billion years, long after the Sun has died, the Earth and the Moon will finally be tidally locked to each other, just like Romeo and Juliet, Fry and Leela, Pluto and Charon. The force of gravity is a powerful thing. Powerful enough to stop a moon in its tracks.

Did you have any other questions about the Moon? Post your suggestions in the comments and we’d be glad to make more videos and dig deeper!