The Classroom
Learn Space, Properly
Why Rockets Fall SidewaysOrbit isn't about going up — it's about going sideways so fast that you keep missing the Earth. This is the single most useful idea in spaceflight.
The Tyranny of the Rocket EquationOne short equation explains why rockets are enormous, why they shed stages, and why every kilogram to orbit is precious.
How to Read a LaunchT-minus, holds, MECO, GO polls — a launch broadcast has its own language. Learn it once and every countdown becomes a story you can follow.
Catching a Space StationThe ISS crosses its own sky at 28,000 km/h, and a crew capsule has to arrive at the same place, at the same speed, gently enough to touch. The way it's done breaks your driving instincts — in orbit, you slow down to catch up.
Why Mars Launches Every 26 MonthsMars missions leave Earth in bunches, then nothing for two years. That rhythm isn't bureaucracy — it's the Solar System's own timetable, and it explains half the launch calendar.
Coming Home Is the Hard PartGetting to orbit takes nine minutes of violence. Getting back means shedding all of that speed with no engine to spare — so spacecraft do something audacious: they use the air itself as the brake.
How Rockets SteerA rocket has no wings that matter, no rudder, and spends most of its flight in air too thin to push against. So how does a 100-meter tower fly a curved path to a precise orbit? By aiming the fire itself.
The Engine Zoo: How Rockets BurnAll rocket engines throw fire out the back — but under the skin they're wildly different machines, built around one monstrous problem: feeding a fire that drinks a swimming pool of propellant in seconds.
Why the Moon Changes ShapeThe Moon doesn't change — your seat does. Phases are the one astronomy lesson you can verify with your own eyes every single week.
Meteor Showers Are Comet DustEvery August, Earth drives through the debris trail of a comet that last passed by in 1992. Shooting stars are litter — and they arrive on a schedule.
How to Catch the Space StationThe ISS is often the brightest thing in the evening sky, and its appearances can be predicted to the minute. Here's why the schedule works.
Eclipses: The Great CoincidenceThe Moon is 400 times smaller than the Sun and 400 times closer — a cosmic accident that gives Earth the best eclipses in the Solar System.
The Aurora Is Space Weather You Can SeeThe northern lights are the visible end of an invisible battle: solar wind against Earth's magnetic shield. Learn what the colors mean, why the poles get the show, and when the rest of us get a turn.
Star-Hopping: How to Find Anything TonightAstronomers before GPS found their way with a trick you can learn in one evening: use the stars you know as signposts to the ones you don't. Add the brightness scale and one planet-spotting rule, and the sky becomes a map.
Why Venus Is Hotter Than MercuryMercury sits closer to the Sun, yet Venus is the hottest world we know. The answer is an atmosphere that traps heat better than any oven door.
Mars: The Water Detective StoryNobody has ever seen a Martian river — yet we know they existed. Mars is a four-billion-year-old crime scene, and the rovers are the detectives.
The Ocean MoonsThe most promising places to look for life aren't planets at all. They're small icy moons hiding oceans bigger than all of Earth's seas combined.
The Sun Has WeatherThe Sun isn't a steady lamp — it's a storming star that flings billion-tonne clouds of plasma across the Solar System. Its weather has knocked out power grids, dropped satellites from orbit, and it runs on a cycle you can follow.
The Scale Nobody's Diagram ShowsEvery poster of the Solar System lies to you — it has to, or the page would be blank. The truth about the distances is the single most mind-adjusting fact in astronomy, and it's worth feeling at least once.
Why Jupiter Runs the Solar SystemJupiter isn't just the biggest planet — it's a gravitational government. It herds asteroids, redirects comets, and may have redrawn the entire map of the Solar System before Earth was finished forming.
Light Is a Time MachineEvery telescope is a history instrument. Look far enough away and you are looking billions of years into the past — astronomy's strangest everyday fact.
Finding Planets We Can't SeeThousands of planets orbit other stars, and almost none have ever been photographed. We found them by watching stars blink and wobble.
A Telescope Is a Light BucketThe most common question about telescopes — how much do they magnify? — is the wrong one. A telescope's real job is to collect light, and the whole history of astronomy is the history of bigger buckets.Are the Pictures Real?Those glowing nebula photos get accused of being 'fake color' — and the accusation misses what's actually happening. The pictures are real data, honestly translated from light your eyes were never built to see.
How We Talk to SpacecraftThere is no joystick for a Mars rover. Commands crawl across the Solar System at light speed, and the replies arrive almost unimaginably faint — caught by three giant ears that keep the whole sky covered as Earth turns.
What Is a Black Hole, ActuallyBlack holes are the most mythologized objects in space, and the myths obscure something stranger: a region where gravity has won completely, sitting in the center of our own galaxy — photographed, weighed, and orbited.
How We Measure the UniverseNobody has a tape measure a billion light-years long. Distances to galaxies rest on a ladder of overlapping tricks — each rung calibrating the next — and right now, the ladder's top is producing the biggest argument in cosmology.
The Beep That Started EverythingOn October 4, 1957, a polished metal sphere the size of a beach ball began circling the Earth, transmitting a simple radio pulse. Anyone with a shortwave set could hear it. Nothing about the world was the same afterward.
Eight Years to the MoonWhen Kennedy promised the Moon in May 1961, America's entire human spaceflight experience was one 15-minute suborbital hop. Eight years later, Neil Armstrong stepped off the ladder. It remains the wildest schedule ever kept.
The Station the Cold War BuiltThe International Space Station was assembled in orbit by the two rivals of the space race, piece by piece, and has been continuously inhabited since November 2000. Most people alive today have never lived a day when everyone was on Earth.
The Day the Rocket LandedFor sixty years, every orbital rocket was thrown away after one use — like scrapping an airliner after each flight. On December 21, 2015, a Falcon 9 booster came back and landed. The economics of space have been bending ever since.
Apollo 13: The Successful FailureFifty-six hours into a Moon mission, an oxygen tank exploded 320,000 kilometers from home. What followed is the finest case study in engineering calm ever recorded — and the reason astronauts still study it.
Your Body in FreefallThe human body spent four billion years learning to live with gravity — then astronauts started leaving it behind for months at a time. What happens next is the strangest medical experiment ever run, and every crew member is a data point.
A Day on the StationSixteen sunrises, a schedule planned to five-minute blocks, sleeping bags clipped to walls, and yesterday's coffee recycled into tomorrow's. An ordinary Tuesday, 400 kilometers up.
How Do You Become an Astronaut?It's the most oversubscribed job on (and off) Earth: thousands apply for every seat. But the actual path is more knowable than the mystique suggests — and it's changing shape right now.
Spacewalking: The Hardest Job in OrbitA spacewalk looks serene — an astronaut drifting above the blue Earth. Inside the suit it's a seven-hour athletic event in a personal spacecraft, where the enemy isn't the void but your own gloves.
Why Do Astronauts Float?It's not because there's no gravity up there — gravity in space is almost as strong as it is in your bedroom. Astronauts float for a sneakier reason, and once you get it, you'll know a secret most grown-ups don't.
What Do Astronauts Eat?No fridge full of snacks, no pizza delivery, and bread is basically banned. Dinner in space is a puzzle — because in space, your food floats too.
Where Does Space Begin?Space isn't far away. If your car could drive straight up, you'd be there in about an hour. The tricky part isn't getting to space — it's what the sky does on the way.
Could I Live on Another Planet?Not yet — but you asked the exact question the world's space agencies are working on. Here's an honest tour of the two best options, and what we'd have to pack.
Why Is the Sky Dark at Night?This sounds like the easiest question in the world — the Sun went down, silly! But look closer and it turns into one of the deepest puzzles ever asked. The darkness over your head is actually a clue about how the whole universe began.
Who Owns the Moon?Nobody — on purpose. In 1967, at the height of the space race, the world agreed that no flag on the Moon would ever mean ownership. That treaty still governs everything above your head, and it's being stress-tested right now.
The Rules of OrbitOrbit is a shared highway with no lanes painted on it: tens of thousands of tracked objects, a liability treaty written in 1972, and one long-prophesied traffic jam everyone is trying to avoid.
Who Pays for Space?Ask people what share of the US budget NASA gets and the guesses run wild. The real number — and the story of how one contracting idea rewired the industry — explains more about modern spaceflight than any engine diagram.
From Idea to Launch PadThe telescope that redefined astronomy was sketched before some of its engineers were born. Here's the long, strange pipeline every mission crawls through — and how the rovers got their names from schoolkids along the way.
Why Rockets Launch from FloridaLaunch sites aren't chosen for the weather — Florida's is famously terrible. They're chosen by physics and geography: a free speed boost from the spinning Earth, an empty ocean to drop stages into, and a map of orbits each pad can reach.Lessons are original Everything Space writing. Figures are standard textbook values, approximate where marked. Photography: NASA, ESA/ESO, and Wikimedia Commons contributors — credited on every lesson.