Search

NASA+

Search

Suggested Searches

Climate Change
Artemis
Expedition 64
Mars perseverance
SpaceX Crew-2
International Space Station
View All Topics A-Z

Home
Missions
Humans in Space
Earth
The Solar System
The Universe
Science
Aeronautics
Technology
Learning Resources
About NASA
Español

News & Events
Multimedia
NASA+

Featured

NASA Opens New Flight Dynamics Research Facility in Virginia

article18 hours ago

A total solar eclipse is seen in Dallas, Texas on Monday, April 8, 2024. A total solar eclipse swept across a narrow portion of the North American continent from Mexico’s Pacific coast to the Atlantic coast of Newfoundland, Canada. A partial solar eclipse was visible across the entire North American continent along with parts of Central America and Europe.

NASA Sets Coverage for August Northern Hemisphere Total Solar Eclipse

article3 days ago

Commissioning Update for Spacecraft to Boost NASA’s Swift

Commissioning Update for Spacecraft to Boost NASA’s Swift

article4 days ago

Missions

Search All NASA Missions
A to Z List of Missions
Upcoming Launches and Landings
Spaceships and Rockets
Communicating with Missions
Artemis
James Webb Space Telescope
Hubble Space Telescope
International Space Station
OSIRIS-Rex

Humans in Space

Why Go to Space
Astronauts
Commercial Space
Destinations
Spaceships and Rockets
Living in Space

Earth

Explore Earth Science
Climate Change
Earth, Our Planet
Earth Science in Action
Earth Multimedia
Earth Data
Earth Science Researchers

The Solar System

The Sun
Mercury
Venus
Earth
The Moon
Mars
Jupiter
Saturn
Uranus
Neptune
Pluto & Dwarf Planets
Asteroids, Comets & Meteors
The Kuiper Belt
The Oort Cloud
Skywatching

The Universe

Exoplanets
The Search for Life in the Universe
Stars
Galaxies
Black Holes
The Big Bang
Dark Energy
Dark Matter

Science

Earth Science
Planetary Science
Astrophysics & Space Science
The Sun & Heliophysics
Biological & Physical Sciences
Lunar Science
Citizen Science
Astromaterials
Aeronautics Research
Human Space Travel Research

Aeronautics

Science in the Air
NASA Aircraft
Flight Research Innovation
Supersonic Flight
Air Traffic Solutions
Green Aviation Tech
Drones & You

Technology

Technology Transfer & Spinoffs
Space Travel
Living in Space
Lunar Surface Technology
Manufacturing and Materials
Robotics
Science Instruments
Computing

Learning Resources

For Kids and Students
For Educators
For Colleges and Universities
For Professionals
Science for Everyone
Requests for Exhibits, Artifacts, Speakers & Flyovers
STEM Engagement at NASA

About NASA

NASA's Impacts
Centers and Facilities
Directorates
Organizations
People of NASA
Careers
Internships
Our History
Doing Business with NASA
Get Involved
Contact

NASA en Español

Ciencia
Aeronáutica
Ciencias Terrestres
Sistema Solar
Universo

News & Events

News Releases
Recently Published
Video Series on NASA+
Podcasts & Audio
Blogs
Newsletters
Social Media
Media Resources
Events
Upcoming Launches & Landings
Virtual Guest Program

Multimedia

NASA+
Images
NASA Live
NASA Apps
Podcasts
Image of the Day
e-Books
3D Resources
Interactives
STEM Multimedia
NASA Brand & Usage Guidelines

Featured

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

article 3 days ago

NASA Webb Explores Family Tree of Newly Discovered Distant Objects

NASA Webb Explores Family Tree of Newly Discovered Distant Objects

article 3 days ago

NASA Fuels Roman Space Telescope for Late August Launch

NASA Fuels Roman Space Telescope for Late August Launch

article 5 days ago

Highlights

Establishing Crew Exposure Limits of Martian Dust

Establishing Crew Exposure Limits of Martian Dust

article 2 weeks ago

Establishing a VTE Risk Score for Astronauts Algorithm

Establishing a VTE Risk Score for Astronauts Algorithm

article 2 weeks ago

NASA Seeks Industry Input on Second Phase of Commercial Space Stations

NASA Seeks Industry Input on Second Phase of Commercial Space Stations

article 4 weeks ago

Highlights

EAGLE

article 13 hours ago

Accelerating Earth Solutions (ROSES A.13)

Accelerating Earth Solutions (ROSES A.13)

article 15 hours ago

Destructive Fires Char Western Europe

Destructive Fires Char Western Europe

article 1 day ago

Highlights

What’s Up: August 2026 Skywatching Tips from NASA

What’s Up: August 2026 Skywatching Tips from NASA

article 13 hours ago

EAGLE

article 13 hours ago

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

article 3 days ago

Featured

NASA Webb Explores Family Tree of Newly Discovered Distant Objects

NASA Webb Explores Family Tree of Newly Discovered Distant Objects

article 3 days ago

NASA’s Swift Sees ‘Wandering’ Mega Black Hole Shredding Star

NASA’s Swift Sees ‘Wandering’ Mega Black Hole Shredding Star

article 5 days ago

NASA’s Hubble Shows Star Formation in Andromeda Galaxy Winding Down

NASA’s Hubble Shows Star Formation in Andromeda Galaxy Winding Down

article 5 days ago

Highlights

Accelerating Earth Solutions (ROSES A.13)

Accelerating Earth Solutions (ROSES A.13)

article 15 hours ago

A.14 Atmosphere Several Corrections

A.14 Atmosphere Several Corrections

article 2 days ago

Correction to C.4 Planetary Science Enabling Facilities

Correction to C.4 Planetary Science Enabling Facilities

article 3 days ago

Highlights

Michael T. Lippert

Michael T. Lippert

article 1 week ago

NASA, GE Aerospace Work Enables Hybrid-Electric Flight Demonstration

NASA, GE Aerospace Work Enables Hybrid-Electric Flight Demonstration

article 2 weeks ago

NASA Pushes New Wing Design to Find Structural Limits

NASA Pushes New Wing Design to Find Structural Limits

article 2 weeks ago

Highlights

EAGLE

article 13 hours ago

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

NASA’s Curiosity Mars Rover Discovers Field of Honeycomb Textures

article 3 days ago

Request for Information – Potential [Placeholder for Prize]

Request for Information – Potential [Placeholder for Prize]

article 1 week ago

Featured

Space Out This Summer with Variety of NASA STEM Activities

Space Out This Summer with Variety of NASA STEM Activities

article 2 months ago

Featured

NASA, SpaceX Advance Wind Tunnel Tests for Starship Rocket

NASA, SpaceX Advance Wind Tunnel Tests for Starship Rocket

article 17 hours ago

NASA Awards 2026 Innovative Technology Concepts

NASA Awards 2026 Innovative Technology Concepts

article 3 days ago

NASA Opens New Flight Dynamics Research Facility in Virginia

NASA Opens New Flight Dynamics Research Facility in Virginia

article 18 hours ago

Highlights

La NASA anuncia la cobertura de la misión lunar Artemis II

La NASA anuncia la cobertura de la misión lunar Artemis II

article 4 months ago

Agenda diaria de la misión a la Luna de Artemis II de la NASA

Agenda diaria de la misión a la Luna de Artemis II de la NASA

article 5 months ago

La NASA refuerza Artemis: añade una misión y perfecciona su arquitectura general

La NASA refuerza Artemis: añade una misión y perfecciona su arquitectura general

article 5 months ago

Sitemap

December 23, 1999

Home
Sitemap
1999
12
December 23, 1999

APOD: 1999 December 23 – Unusual Aurora During Solar Wind Dropout

National Aeronautics and Space Administration

NASA explores the unknown in air and space, innovates for the benefit of humanity, and inspires the world through discovery.

About NASA's Mission

Home
News & Events
Multimedia
NASA+
Missions
Humans in Space
Earth
The Solar System
The Universe
Science
Aeronautics
Technology
Learning Resources
About NASA
NASA en Español (opens in new tab)

Follow NASA

More NASA Social Accounts
NASA Newsletters

Sitemap
For Media
Privacy Policy
FOIA
No FEAR Act
Office of the IG (opens in new tab)
Budget & Annual Reports
Agency Financial Reports
Contact NASA
Accessibility

Responsible NASA Official:

Abigail Bowman

Was this page helpful?

Δ

Was this page helpful?

Yes

No