# Nasa Wavelength

## Planet Impact: What's Your Angle

In this interactive module, students can vary the comet's angle of approach to see the effect of gravity on its trajectory towards Jupiter. The speed and masses of the two bodies are held constant.

## Stellar Statistician

In this interactive, online activity, students practice estimation skills as they begin to explore the Hubble Deep Field image. Students first give a rough estimate of the number of objects in the image. They then use representative sampling techniques to improve upon their original estimates.

## What SImilar Physical Processes Occur on Both Earth and Mars?

Similar features exist on the surfaces of Earth and Mars. This investigation includes satellite images of five Earth features and five Martian features, none of which are labeled.

## Phytoplankton Blooms and Ocean Warming

In this problem-based learning module, learners study phytoplankton blooms along the U.S. coast. Phytoplankton form the basis of the marine food web, regulate carbon in the atmosphere, and are responsible for half of the photosynthesis that takes place on the planet.

## Matching Birthdays

This excercise uses "the birthday problem," a well-known probability riddle with a surprising result. It serves as a calculator exercise for students and beginning computer programmers.

## SciJinks: How Does a Hurricane Form?

Hurricanes are discussed as one type of tropical cyclone; the article then describes the four stages of cyclone development. The site includes a video of Hurricane Katrina and a link to a related game.

## NASA Satellite Sees Carbon Dioxide

In this problem set, learners will analyze a map of atmospheric carbon dioxide derived from satellite data. Answer key is provided. This is part of Earth Math: A Brief Mathematical Guide to Earth Science and Climate Change.

## Can Photosynthesis Occur At Saturn?

In this hands-on experiment, students will investigate the basic principle of photosynthesis and learn how light intensity diminishes as a function of distance from the light source. Questions help learners connect these two ideas to determine if photosynthesis could occur at Saturn.

## Magnetic Field and Life

This is a lesson where learners explore magnetic forces, fields, and the relationship between electricity. Learners will use this information to infer how the Earth generates a protective magnetic field.

## Exploring the Spectrum

This activity introduces students to the visible light spectrum, and demonstrates what happens to the appearance of an image when certain wavelengths of light are blocked by filters or made visible using special tools. Students are lead through experiments with light and filters, demonstrating th