National Aeronautics and Space Administration

Grades 3 to 5

Big Moons and Small Planets

Comparing Planets Orbiting Other Stars

A Simple Gauge in a Fuel Tank

Cassini Delivers Holiday Treats from Saturn

Fermi Explores the High Energy Universe

A Piece of History � Space Shuttle Thermal Tiles

Tracking a Sea Turtle from a Satellite

Grades 6 to 8

The Launch of the Juno Spacecraft � Ascent to Orbit

Investigating the Launch of the Juno Spacecraft

The Grail and LRO Spacecraft Encounter in Lunar Orbit

Space Shuttle Atlantis (STS-135) - Ascent to Orbit

Space Shuttle Atlantis (STS-135) - Launch Speed

Space Shuttle Atlantis (STS-135) � Exhaust Speed

Space Shuttle Atlantis (STS-135) � Exhaust Plume

Saturn V Rocket Launch Speed and Height

Space Shuttle Endeavor � Last Flight

The Launch of the Mars Science Laboratory

Apollo 17 � Launching from the Moon�s Surface

Challenger (STS-8) Deploys the INSAT-1B Satellite

The Atmospheric Re-Entry of UARS

The Dawn Spacecraft Sees Asteroid Vesta Up Close

LRO Explores the Apollo-12 Landing Area on the Moon

LRO-The Relative Ages of Lunar Surfaces

Predicting the Transits of the Stars Kepler-16A and B

The Arctic Ozone Hole Continues to Grow in 2011

The Arctic�s Changing Ozone Layer

The Declining Arctic Ice Cap During September

The Closest Approach of Asteroid 2005 YU55 - I

The Closest Approach of Asteroid 2005 YU55 - II

Exploring the Solar Wind and Coronal Mass Ejections

Estimating Magnetic Field Speeds on the Sun

How Common are X-Class Solar Flares?

Grades 9 to 12

The Spectacular Cats Eye Planetary Nebula

Mapping Dark Matter in a Distant Cluster of Galaxies

A Simple Model for the Origin of Earth�s Ocean Water

Exploring the New Planet Tatooine

Predicting the Transits of the Stars Kepler 16A and B

Chandra Sees a Distant Planet Evaporating

MESSENGER Explores the Interior of Mercury

MESSENGER explores the Mass of Mercury

Space X Launches the First Commercial Rocket to the ISS

Solar Energy and the Distance to Juno from the Sun

Using a Gravity Lens to Weigh a Cluster of Galaxies

Playing Baseball on the Earth-like Planet Kepler-22b

Exploring Tidal Forces � Black Holes and Saturn�s Rings

The Closest Approach of Asteroid 2005 YU55 - III

Investigating Juno�s Elliptical Transfer Orbit to Jupiter

The Interplanetary Voyage of the Mars Science Laboratory