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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
The Solar System
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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Image Of The Day
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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