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A Stellar Occultation

When a planet’s orbit brings it between Earth and a distant star, it’s more than just a cosmic game of hide-and-seek. Planetary scientists call it a stellar occultation, and that’s exactly what happened with Uranus on Monday, April 7. Observing the alignment allows scientists to measure the temperatures and composition of Uranus’ stratosphere and determine how it has changed over the last 30 years.

Uranus' Atmospheric Properties about A Stellar Occultation

Earth Information Center

For more than 50 years, NASA satellites have provided data on Earth's land, water, air, temperature, and climate. NASA's Earth Information Center allows visitors to see how our planet is changing in six key areas: sea level rise and coastal impacts, health and air quality, wildfires, greenhouse gases, sustainable energy, and agriculture.

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Thistle blooms provide a midday meal for a gulf fritillary butterfly at Merritt Island National Wildlife Refuge in Florida. NASA’s Kennedy Space Center shares boundaries with the refuge, which is home to more than 330 native and migratory bird species, along with 25 mammal, 117 fish, and 65 amphibian and reptile species.

NASA’s Lucy Spacecraft Images Asteroid Donaldjohanson

The asteroid Donaldjohanson as seen by the Lucy Long-Range Reconnaissance Imager (L’LORRI). This is one of the most detailed images returned by NASA’s Lucy spacecraft during its flyby. This image was taken at 1:51 p.m. EDT (17:51 UTC), April 20, 2025, near closest approach, from a range of approximately 660 miles (1,100 km). The spacecraft’s closest approach distance was 600 miles (960 km), but the image shown was taken approximately 40 seconds beforehand. The image has been sharpened and processed to enhance contrast.

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Citizen Science

Do NASA Science

Did you know that NASA Citizen Science volunteers can help unlock some of the universe’s biggest mysteries? Through the agency’s citizen science projects, volunteers work with NASA researchers to make meaningful scientific discoveries, search for life elsewhere, and protect and improve life on Earth and in space.

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NASA’s Hubble Space Telescope captured an unprecedented look at the Orion Nebula, a turbulent stellar nursery that is one of astronomy’s most photogenic celestial regions.
NASA/European Space Agency

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Space image with stars and swirls of colorful orange, red and white.