Ask a NASA Expert
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NASA
What Would It Take to Say We Found Life? We Asked a NASA Expert: Episode 63
What Would It Take to Say We Found Life? We call this the podium test. What would it take for you personally to confidently stand up in front of an international audience and make that claim? When you put it in that way, I think for a lot of scientists, the bar is really high. So of course, there would…
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NASA
How Do We Do Research in Zero Gravity? We Asked a NASA Expert: Episode 62
How do we do research in zero gravity? Actually when astronauts do experiments on the International Space Station, for instance, to environment on organisms, that environment is actually technically called microgravity. That is, things feel weightless, but we’re still under the influence of Earth’s gravity. Now, the very microgravity that we’re trying to study up there can make experiments actually…
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NASA
How Big is Space? We Asked a NASA Expert: Episode: 61
How big is space? Space is really big. Thinking about our solar system, let’s imagine you could get in a car and drive to Pluto at highway speeds. It would take you about 6,000 years to get there. When we start to think about other stars outside of our solar system, we need to think about another unit of distance.…
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NASA
Will the Sun Ever Burn Out? We Asked a NASA Expert: Episode 60
Will the Sun ever burn out? Well, the Sun, just like the stars we see at night, is a star. It’s a giant ball of super hot hydrogen. Gravity squeezes it in and it creates energy, which is what makes the Sun shine. Eventually, it will use up all of that hydrogen. But in the process, it’s creating helium. So…
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NASA
What is a Black Hole? We Asked a NASA Expert: Episode 59
What is a black hole? Well, the name is actually a little misleading because black holes aren’t actually holes. They’re regions in space that have a gravitational pull that is so strong that nothing can escape, not even light. Scientists know about two different sizes of black holes — stellar-mass black holes and supermassive black holes. A stellar-mass black hole…
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NASA
What Are the Dangers of Going to Space? We Asked a NASA Expert: Episode 55
What are the dangers of going to space? For human spaceflight, the first thing I think about is the astronauts actually strapping themselves to a rocket. And if that isn’t dangerous enough, once they launch and they’re out into space in deep exploration, we have to worry about radiation. Radiation is coming at them from all directions. From the Sun,…
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