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Shades of a Lunar Eclipse

2026-03-10 04:01

A grayscale composite satellite image centered on Alaska shows observations at several times during a total lunar eclipse. Snow, ice, and clouds appear bright in swaths acquired before and after the eclipse and darker gray in the partial phase. The scene during the total phase is mostly black.
March 3, 2026

On March 3, 2026, Earth lined up directly between the Moon and the Sun, casting its shadow on the full Moon. The total lunar eclipse was visible throughout the Americas, East Asia, Australia, and the Pacific. Skygazers in those parts of the world may have witnessed a “Blood Moon,” when the dimmed lunar surface temporarily turned an orange-red color.

Meanwhile, satellites observed the effect of the darkened Moon on Earth’s surface. Changes in the amount of moonlight reflected back to Earth as the eclipse progressed appear in this composite image, composed of nighttime observations made by the VIIRS (Visible Infrared Imaging Radiometer Suite) on the NOAA-21 satellite. The satellite collected these images of the Arctic about every 100 minutes, with earlier swaths toward the right and later swaths to the left.

The VIIRS day-night band detects nighttime light in a range of wavelengths from green to near-infrared and uses filtering techniques to observe signals such as city lights, reflected moonlight, and auroras. The darkest swath was acquired at 11:20 Universal Time (2:20 a.m. Alaska Standard Time), about 15 minutes after the total phase had begun. With very little moonlight reaching Earth, ribbons of light from the aurora borealis shine through, along with specks of artificial light from settlements in the Yukon and eastern Alaska.

When the satellite passed over western Alaska and the Bering Strait, at 13:00 Universal Time (4:00 a.m. Alaska Standard Time), the eclipse was in the partial phase. The scene is noticeably brighter than the earlier one, and light from the partially shaded Moon illuminates snow-covered topography and offshore clouds. The brightest swaths on the far right and left sides were acquired before and after the eclipse, respectively, with light from the full Moon.

The next chance to view a total lunar eclipse will occur on December 31, 2028, when it will add a dash of astronomical flair to New Year’s Eve celebrations in Europe, Africa, Asia, Australia, and the Pacific.

NASA Earth Observatory image by Michala Garrison, using VIIRS day-night band data from NASA EOSDIS LANCEGIBS/Worldview, and the Joint Polar Satellite System (JPSS). Story by Lindsey Doermann.

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Stay up-to-date with the latest content from NASA as we explore the universe and discover more about our home planet.

By the Warm Light of the Moon

3 min read

Astronauts and much of Earth’s population had a chance to view a coppery “Blood Moon” during a total lunar eclipse…

Article

City Lights Glow Along Moonlit Waters

3 min read

An astronaut photographed moonglint shimmering across the sea surface and the bright clusters of Florida’s cities at night.

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A Northwest Night Awash in Light

3 min read

The glow of city lights, the aurora, and a rising Moon illuminate the night along the northwest coast of North…

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NASA’s Van Allen Probe A to Re-Enter Atmosphere 

2026-03-09 19:55

3 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

NASA’s Van Allen Probe A is expected to re-enter Earth’s atmosphere almost 14 years after launch. From 2012 to 2019, the spacecraft and its twin, Van Allen Probe B, flew through the Van Allen belts, rings of charged particles trapped by Earth’s magnetic field, to understand how particles were gained and lost. The belts shield Earth from cosmic radiation, solar storms, and the constantly streaming solar wind that are harmful to humans and can damage technology, so understanding them is important. 

As of March 9, 2026, the U.S. Space Force predicted that the roughly 1,323-pound spacecraft will re-enter the atmosphere at approximately 7:45 p.m. EDT on March 10, 2026, with an uncertainty of +/- 24 hours. NASA expects most of the spacecraft to burn up as it travels through the atmosphere, but some components are expected to survive re-entry. The risk of harm coming to anyone on Earth is low — approximately 1 in 4,200. NASA and Space Force will continue to monitor the re-entry and update predictions

Originally designed for a two-year mission, the Van Allen Probes A and B launched on Aug. 30, 2012, and gathered unprecedented data on Earth’s two permanent radiation belts — named for scientist James Van Allen — for almost seven years. NASA ended the mission after the two spacecraft ran out of fuel and were no longer able to orient themselves toward the Sun.  

The Van Allen Probes were the first spacecraft designed to operate and gather scientific data for many years within the belts, a region around our planet where most spacecraft and astronaut missions minimize time in order to avoid damaging radiation.  

The NASA mission, managed and operated by Johns Hopkins University Applied Physics Lab, made several major discoveries about how the radiation belts operate during its lifetime, including the first data showing the existence of a transient third radiation belt, which can form during times of intense solar activity.  

When the mission ended in 2019, analysis found that the spacecraft would re-enter Earth’s atmosphere in 2034. However, those calculations were made before the current solar cycle, which has proven far more active than expected. In 2024, scientists confirmed the Sun had reached its solar maximum, triggering intense space weather events. These conditions increased atmospheric drag on the spacecraft beyond initial estimates, resulting in an earlier-than-expected re-entry. 

Data from NASA’s Van Allen Probes mission still plays an important role in understanding space weather and its effects. By reviewing archived data from the mission, scientists study the radiation belts surrounding Earth, which are key to predicting how solar activity impacts satellites, astronauts, and even systems on Earth such as communications, navigation, and power grids. By observing these dynamic regions, the Van Allen Probes contributed to improving forecasts of space weather events and their potential consequences. 

Van Allen Probe B, the twin of the re-entering spacecraft, is not expected to re-enter before 2030. 

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Last Updated
Mar 09, 2026
About Subsonic Flight Demonstrator (SFD) Project

2026-03-09 19:00

1 min read

Preparations for Next Moonwalk Simulations Underway (and Underwater)

An illustration of the transonic truss-braced wing aircraft configuration for the Subsonic Flight Demonstrator (SFD) project.
NASA / Scott Anders / Lillian Gipson / Rich Wahls

The purpose of the Subsonic Flight Demonstrator (SFD) project is to engage with industry and other government organizations to identify, select, and mature key airframe technologies, such as new wing designs, that have a high probability of transition to the next generation single-aisle seat class airliner. 

Moving technologies from a research environment to a production environment can be a real challenge for industry manufacturers and frequently these promising technologies do not get adopted due to a variety of technical and economic risks.  

NASA in partnership with industry plan to: 

  • Develop and flight test an advanced airframe configuration and related technologies to dramatically reduce aircraft fuel burn.  
  • Obtain ground data that will be used by the NASA/industry teams to validate the benefits of the new technologies.  
  • Use the research results to help industry make decisions associated with next generation single-aisle airliner.  

SFD Project Leadership

Project Manager 

Sarah Waechter 

Deputy Project Manager 

Rich DeLoof 

Chief Engineer 

Dr. Renee Horton 

Technology Development 

Tony Washburn 

Program Planning and Control (PP&C) Lead 

Stephanie Hamrick 

IASP
ARMD

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Last Updated
Mar 09, 2026
Editor
Jim Banke
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About Flight Demonstrations and Capabilities (FDC) Project

2026-03-09 18:30

Image of a sleek, white airplane with a sharp, pointed nose flies above arid mountains. The plane's wheels are down. NASA is painted in blue lettering on its tail. The X-59 has a role in NASA's Flight Demonstrations and Capabilities (FDC) project.
NASA’s X-59 quiet supersonic research aircraft lifts off for its first flight Tuesday, Oct. 28, 2025, from U.S. Air Force Plant 42 in Palmdale, California. The aircraft’s first flight marks the start of flight testing for NASA’s Quesst mission, the result of years of design, integration, and ground testing and begins a new chapter in NASA’s aeronautics research legacy.
NASA/Lori Losey

The FDC project conducts complex integrated small-scale flight research to validate the benefits of new technologies.

By modifying aircraft from FDC’s support fleet, the project enables aggressive, success-oriented flight campaign schedules. While many technologies are at mid-levels of technology readiness, the FDC project supports all phases of technology maturation.  

FDC’s support aircraft fleet enables safety chase and in-flight experimental measurements for a variety of NASA missions.

The project collaborates with academia, industry, and government organizations to leverage flight opportunities, and engages with NASA researchers and university students to bring innovative concepts to flight.  

The FDC project operates, sustains, and enhances other national flight research capabilities that enable complex high-risk flight research for both NASA and the aviation industry.

These capabilities are located at NASA’s Armstrong Flight Research Center at Edwards, California, and includes the Aeronautics Test Data Portal, Flight Loads Laboratory, the Dryden Aeronautical Test Range, and a suite of flight simulators.

The project leverages collaborative opportunities for flight testing from across the aeronautical industry. 

Flight Research Facilities

The FDC project validates benefits associated with critical technologies through focused flight experiments. Through the integration of appropriate flight test capabilities and assets — whether from NASA. other government agencies, or industry — FDC campaigns focus on aggressive, success-oriented schedules using the best collection of assets.

The FDC project supports tests of technology at all phases of maturation.

Flight Loads Laboratory

Simulation Lab

Research Aircraft Integration Facility

Dryden Aeronautical Test Range

Support Aircraft and Maintenance Operations

FDC

IASP  

Contact Information

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Last Updated
Mar 09, 2026
Editor
Jim Banke
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What Is Pi? (Grades 5-8)

2026-03-09 18:10

3 Min Read

What Is Pi? (Grades 5-8)

Futuristic graphic for Pi Day

This article is for students grades 5-8.

What is Pi?

Pi is a number. You might know it as 3.14 or the symbol π. But it’s way more than that!

What Makes Pi Special?

Pi is an irrational number. That means it goes on forever and it never repeats its sequence of numbers. Pi has been calculated to more than one trillion digits! But NASA scientists and engineers use far fewer digits in their calculations. Usually, the approximation of 3.14 is precise enough.

Pi is the circumference of a circle divided by the circle’s diameter. Pi is the same for any circle, no matter how big or small. It is a mathematical constant.

———————————————————————————————

Words to Know

irrational number: a number that cannot be expressed as a simple fraction

circumference: the distance around a circle

diameter: the distance of a straight line across the center of a circle

———————————————————————————————

How Is Pi Used?

Pi is used in lots of ways. It’s fundamental for calculating anything that involves circles, curves, or spheres. It’s used in geometry, physics, engineering, and even computer science.

How Does NASA Use Pi?

NASA missions depend on pi. Let’s look at a few examples.

Spacecraft returning to earth, slowed down by

Astronauts returning home from the International Space Station use parachutes to slow their spacecraft down for a safe landing. But just how big do the parachutes need to be? NASA uses pi to calculate the circular area required to slow a spacecraft as it moves through the atmosphere.

Planetary scientists use pi to learn about the materials inside a planet or asteroid. They use pi to determine the object’s volume. Combined with the object’s mass, they can determine the density of the object. Since we know the densities of planetary materials like rock, ice, and metal, scientists can make informed guesses about what the planet or asteroid might be made of.

Did you know that spacecraft fuel tanks are usually sphere-shaped? Rocket scientists use pi to figure out how much fuel a spacecraft will need. They also use pi to compute how much fuel is available in spacecraft tanks and how quickly that fuel travels through their cylindrical fuel lines.

To learn more ways pi helps NASA explore our home planet and beyond, check out 18 Ways NASA Uses Pi.

Career Corner

Are you interested in a career that uses pi? Many different occupations use this mathematical wonder. Here are a few examples:

  • Manufacturing technician: Turning designs into reality takes skilled technicians. Fabrication and assembly of robotic equipment and spacecraft parts often involve curves that must be precisely calculated. Being able to follow intricate instructions is key. Trade school training and skills such as operating forklifts and heavy machinery may be required.
  • Mars rover driver: Driving a rover on Mars is not like driving a car on Earth. There are no steering wheels on Mars rovers. Instead, operators on Earth send commands to the rovers. These might include turning wheels or moving a robotic arm, and those functions use degrees calculated using pi. College degrees in robotics and software engineering might lead to this career.
  • Planetary scientist: What are objects in our solar system made of? And where did the planets, moons, asteroids, and comets come from? Planetary scientists use pi to answer these questions and more as they study our celestial neighborhood. A college degree is key to being an expert in this field, but subject areas can vary from physics to astronomy, or even geology.

Explore More

How Many Decimals of Pi Do We Need Anyway?
The NASA Pi Day Challenge

TechCrunch - Latest

Whoop launches a new blood test focused on women’s health

2026-03-10 10:00

The wearable maker is launching a new panel focused on women's health through its Whoop Labs blood testing service. It's also adding a new feature to its app that surfaces information about hormonal changes during menstrual cycles.
Uzbekistan’s Uzum valuation leaps over 50% in seven months to $2.3B

2026-03-10 07:15

Uzum now reaches 20 million users and processes $11B in payments as it expands its e-commerce and fintech ecosystem across Uzbekistan.
Apple now makes one in four iPhones in India: report

2026-03-10 06:04

Apple reportedly produced 55 million units in India last year, a shift accelerated as Apple faced growing uncertainty in China.
Yann LeCun’s AMI Labs raises $1.03 billion to build world models

2026-03-10 05:00

AMI Labs, the new venture cofounded by Turing Prize winner Yann LeCun after he left Meta, has raised $1.03 billion at a $3.5 billion pre-money valuation.
An iPhone-hacking toolkit used by Russian spies likely came from U.S military contractor

2026-03-10 01:56

Google found a series of hacking tools they said were used by a Russian espionage group and a cybercriminal group in China. Sources from a U.S. government defense contractor said some of those hacking tools were theirs.
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