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Young Voices for the Planet DVD in our online store includes 8 films where students speak out and take action on climate change.

Advanced Ulysses Word Search

When you find a word, click on the first (or last) letter and hold down the mouse button. Drag the cursor to the last (or first) letter and release.

Words can be horizontal or diagonal, forwards or backwards. They can even cross! So have fun and good hunting! Try our Beginner or Intermediate levels for variety...

Tell me more about these words: Ulysses, plasma, streamer, HISCALE, neutrino, photosphere, slingshot, wind, ejection, SWICS, sunspots, core, FGM, Jupiter, flare, hot, granulation

Shop Windows to the Universe Science Store!

Cool It! is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store.

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Traveling Nitrogen Classroom Activity Kit

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Helmet Streamers and the Magnetic Structure of the Corona

The gas in the solar corona is at very high temperatures (typically 1-2 million kelvins in most regions) so it is almost completely in a plasma state (made up of charged particles, mostly protons and electrons)....more


The neutrino is an extremely light (and possibly massless) neutral particle. The neutrino belongs to the family of leptons, the particles that interact through the so-called weak force. For this reason...more

The Photosphere - the "Surface" of the Sun

Most of the energy we receive from the Sun is the visible (white) light emitted from the photosphere. The photosphere is one of the coolest regions of the Sun (6000 K), so only a small fraction (0.1%)...more


Sunspots are dark, planet-sized regions that appear on the "surface" of the Sun. Sunspots are "dark" because they are cooler than their surroundings. A large sunspot might have a central temperature of...more

The Solar Core

The solar core is made up of an extremely hot and dense gas (in the plasma state). Despite a density of 160,000 Kg/m3, the temperature of 15 million kelvins (27 million degrees Faranheit) prevents the...more

Creating Elements up to Iron

When the temperature in the core of a star reaches 100 million degrees Kelvin fusion of Helium into Carbon occurs (three Helium nuclei combine to form a nucleus of Carbon). In the same range of temperature...more

Binding Energy

A plot of the binding energy per nucleon vs. atomic mass shows a peak atomic number 56 (Iron). Elements with atomic mass less then 56 release energy if formed as a result of a fusion reaction. Above this...more

Windows to the Universe, a project of the National Earth Science Teachers Association, is sponsored in part is sponsored in part through grants from federal agencies (NASA and NOAA), and partnerships with affiliated organizations, including the American Geophysical Union, the Howard Hughes Medical Institute, the Earth System Information Partnership, the American Meteorological Society, the National Center for Science Education, and TERC. The American Geophysical Union and the American Geosciences Institute are Windows to the Universe Founding Partners. NESTA welcomes new Institutional Affiliates in support of our ongoing programs, as well as collaborations on new projects. Contact NESTA for more information. NASA ESIP NCSE HHMI AGU AGI AMS NOAA