Xavier SmithWONDER LAB Pick a mission
WELCOME TO XAVIER'S WORLD

Curiosity looks good on you.

A place to make numbers click, chase the mysteries of space, and build whatever you can imagine.

Let's explore Jump into math
Learn by trying. Wonder out loud. Build your own way.
YOUR NEXT ADVENTURE

Choose your kind of wonder.

Three ways in. No wrong place to start.

01 / THE THINKING ZONE

Make math
make sense.

Explore nine math topics across five levels, from number facts to algebra.

Enter the Math Lab 02 / THE DISCOVERY ZONE

Go way
out there.

Meet black holes and explore the edge of the unknown.

Launch into Space 03 / THE MAKING ZONE

Dream it.
Build it.

Make whole worlds with characters, vehicles, trees, and an endless brick canvas.

Open Brick Studio
MATH LAB / LEARN BY DOING

A little practice.
Big discoveries.

Choose a topic and level. Study a worked example, solve a question, and explain your thinking. The hardest levels ask you to type an answer.

DIVISION MISSIONQUESTION 1
1 / SEE IT

Let's learn together

    2 / TRY IT

    Let's share equally.

    Loading your mission…

    PICK AN ANSWER

    Wonder note: factorials are written with an exclamation mark. For example, 4! = 4 × 3 × 2 × 1. Every level is open—pick the challenge that feels right.

    MATH MAKER / MOVE THE MODEL

    Change it. See it. Understand it.

    Choose a concept, move the controls, and notice what stays the same.

    Equal groups

    Move the sliders to share a total into equal groups.

    SPACE ZONE / ASK BIG QUESTIONS

    What's up with
    black holes?

    They are mysterious, real, and pretty amazing. Take a little space trip to learn what scientists know.

    THE EXPLORER

    Out in the universe

    A black hole has enormous gravity. Like other objects with mass, it pulls on nearby things.

    FAR AWAYEVENT HORIZON

    Scientists find black holes by studying how they affect nearby stars, gas, and light.

    01

    Invisible center

    We cannot see a black hole itself, because light cannot escape from inside its event horizon.

    02

    The point of no return

    The event horizon is the boundary beyond which light cannot get back out.

    03

    Stretchy space

    Near some black holes, gravity can pull more strongly on one end of an object than the other.

    SPACE FIELD GUIDE / FOLLOW THE CLUES

    How do we know they're there?

    A black hole is dark, but its surroundings can tell a story. Choose a clue to investigate.

    FOLLOW THE MOTION

    Stars reveal an invisible neighbor

    Astronomers can track stars moving around a dark spot. Their orbits reveal the mass of what they cannot see directly.

    Wonder: what could make a star change direction?

    BLACK HOLE ATLAS / BIG AND SMALL

    One name. Very different sizes.

    Scientists group black holes by mass: how much matter they contain. The circles below are symbols, not a scale drawing.

    01 / STELLAR-MASS

    Born from some giant stars

    A very massive star can leave a black hole when its core collapses. These black holes can hold a few to hundreds of Suns' worth of mass.

    02 / INTERMEDIATE-MASS

    The middleweights

    Scientists are looking for more of these. They may help explain how the biggest black holes grew.

    03 / SUPERMASSIVE

    Giants in galaxy centers

    Many large galaxies, including our Milky Way, have one at the center. Their masses can reach millions or billions of Suns.

    Wonder question: does a black hole's gravity act like a vacuum cleaner? No. Far away, it pulls like any other object with the same mass.

    ANATOMY LAB / TAP A FEATURE

    What's around a black hole?

    Explore this artist-style diagram. Some black holes have bright disks or jets; others do not.

    FOLLOW THE LIGHT

    The gas glows; the black hole does not.

    Gas outside some black holes can spin, heat up, and shine. Astronomers call that bright region an accretion disk.

    Look closely: which part can we see because it gives off light?
    SPACE CHECK / THINK LIKE A SCIENTIST

    What did you discover?

    Pick an answer. If it is tricky, use the clue and try again.

    KEEP INVESTIGATING / NASA LIBRARY

    Choose your next space mission.

    These open NASA pages in a new tab. Start with a short explanation, then explore real science and observations.

    START HERE · FOR KIDSWhat is a black hole?NASA Space Place's quick explanation and video.Explore ↗ GO DEEPER · PARTSAnatomy of a black holeEvent horizons, glowing disks, shadows, and jets.Explore ↗ GO DEEPER · SIZESTypes of black holesCompare stellar, intermediate, and supermassive kinds.Explore ↗ WATCH · FIELD GUIDENASA's black hole videosA playful series that goes from basics to big discoveries.Watch ↗ SEE REAL EVIDENCEThe first black hole imageLook at M87's dark shadow against hot gas.See it ↗ WATCH · SIMULATIONFly around a black holeNASA's computer visualization of a journey near one.Watch ↗ MAKE · ACTIVITIESBlack hole activity booksNASA's K–8 puzzles and learning materials.Explore ↗
    BRICK STUDIO / AN ENDLESS PLACE TO MAKE

    Build a whole world.

    Start with one piece, then keep going. Your canvas grows as far as your imagination can take it.

    ✦ 29 original parts↗ Open-ended canvas◈ 3D views
    0 pieces
    BUILD VIEW · tap to place
    100%

    Arrow keys move the cursor; Enter places a piece. Select a piece with Move, then use arrows to move it, R to rotate, or Delete to erase. Use Pan to travel anywhere.

    CENTER · 0, 0
    Auto-saved in this browser

    ONE LAST THING

    Keep asking “what if?”

    That's how discoveries begin.

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