Can you use π (pi) to solve these stellar math problems faced by NASA scientists and engineers?

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    Can't get enough pi? Download this year's NASA Pi Day Challenge graphics as mobile phone and web meeting backgrounds:

NASA Pi Day Challenge

In this cartoonish illustration, OSIRIS-REx descends on a purple, rocky surface. An inset shows a circular device with small circular pads. An arrow points to one of the pads and identifies it as a collection pad.

In this cartoonish illustration, a split-screen shows a helicopter in flight with its blades circled and arrows pointing in a clockwise direction. Below is the small Ingenuity helicopter on Mars. Its two sets of blades are also circled with arrows for one

In this cartoonish illustration, a giant dish is shown on a pink desert landscape with the sun setting and clouds drifting by. An inset in the upper left corner shows the Voyager spacecraft sending a wide signal and another spacecraft sending a narrow, fo

In this cartoonish illustration, a yellow Sun has curly flares jutting from its surface. Lines radiate out from the Sun representing solar wind flowing above and around concentric circles around Earth representing the planet's magnetic field.

Illustration (split-screen) of Perseverance landing on Mars in a smaller landing ellipse compared with Curiosity's.

Illustration of Arrokoth orbiting the Sun with New Horizons flying by.

Illustration of an airplane flying over the ocean with coral shown below the water's surface. A spectral ray expands from the airplane down to the ocean floor

Illustration of two planets orbiting the star Beta Pictoris surrounded by a disk of debris. An inset illustration of the Spitzer space telescope shows a triangular beam representing the spacecraft's view of the disk

Illustration of Mars before the dust storm with the view from the rover showing full sun, then a view after the dust storm with the rover's view of the sun blacked out

Illustration of clouds floating over the land with a large cloud in the middle showing an outline of a cylinder and a measurement of 10 km. The terra satellite is flying above with arrays from its nine cameras pointing down at the land.

Illustration showing Jupiter and its great red spot in 1979 with the Voyager spacecraft flying by on one side. On the other side, Jupiter's great red spot is smaller and an inset shows the Hubble Space Telescope imaging the planet.

Illustration showing a laser pointed down at ice on one side. On the other side the ice has been exploded and an inset shows molecules, including amino acids.

Animation of Kepler-186f orbiting its star

Animation of helium rain inside Jupiter

Animation of NASA's InSight Mars lander sensing a marsquake

Animation of asteroid 'Oumuamua traveling past the Sun

Crater Curiosity - Craters on Mars - NASA Pi Day Challenge

Epic Eclipse - Craters on Mars - NASA Pi Day Challenge

Finale Fanfare - Craters on Mars - NASA Pi Day Challenge

Habitable Hunt - NASA Pi Day Challenge

Hazy Halo - Titan Pi in the Sky Pi Day Challenge

Round Recon - Mars Reconnaissance Orbiter Pi in the Sky Pi Day Challenge

Sun Screen - Transit of Mercury Pi in the Sky Pi Day Challenge

Gravity Grab - Juno Orbit Insertion at Jupiter Pi in the Sky Pi Day Challenge

Mars Marathon - Mars Exploration Rover Opportunity Pi in the Sky Pi Day Challenge

Pixel Puzzler - Dawn at Ceres Pi in the Sky Pi Day Challenge

Frozen Formula - Europa Pi in the Sky Pi Day Challenge

Hear Here - Voyager Deep Space Network Pi in the Sky Pi Day Challenge

Satellite Solver - SMAP Earth satellite Pi in the Sky Pi Day Challenge

Roving Riddle - Curiosity Mars Rover Pi in the Sky Pi Day Challenge

Jupiter Jockey - Juno at Jupiter Pi in the Sky Pi Day Challenge

Flying Formula - Cassini at Saturn Pi in the Sky Pi Day Challenge