- the study of everything in space beyond the Earth's atmosphere
- the smallest building blocks of all matter
- bright bands of glowing light that appear in the skies near the polar regions, caused by the interaction between the Earth's magnetic field and charged particles from the Sun.
- an imaginary straight line around which an object rotates
- Coronal Mass Ejections
- huge eruptions from the sun's surface that throw out up to 20 billion tons of matter, traveling a million or more miles per hour — the biggest, most violent solar explosions.
- a straight line going through the center of a circle or sphere
- Active, energetic, and changeable; not static
- fossil fuels
- a natural fuel such as coal or gas, formed in the past from the remains of living organisms.
- a collection of thousands to billions of stars held together by gravity
- the attractive force of a body in space that pulls matter together
- life cycle
- the series of changes and developments through the course of a lifespan, beginning with birth or formation and ending with death or destruction.
- magnetic field
- the space around a star or planet where the magnetic force is active
- small chunks of rock from space that land on the Earth's surface
- the National Aeronautics and Space Administration, the agency in charge of all space programs for the United States
- a cloud of dust and gas in space in which a star is born
- nuclear fusion
- the process of joining two or more lightweight atoms to form one heavier atom, resulting in release of energy; nuclear fusion takes place in the Sun's core
- The process by which green plants use energy from the sun to make their food and release oxygen into the air
- spherical bodies in space that circles around a central star and reflects that star's light
- the energy or particles released from explosions, chemical reactions, or radioactive materials
- to move in an orbit around another object, for example: the Earth revolves around the Sun and the moon revolves around the Earth.
- to spin around a center point or axis
- objects that orbit another object, whether natural (the moon) or man-made (spacecraft)
- solar cells
- batteries or panels that can capture sunlight and turn it into electricity
- solar eclipse
- an event that takes place when the moon moves between the Sun and the Earth, blocking out the sun and casting a shadow on the Earth.
- Solar flares
- bursts of energy and particles from the sun that release gases, radiation, and magnetic storms
- solar system
- the Sun, and all the planets and other objects that orbit around it.
- solar wind
- the constant stream of particles and energy emitted by the Sun
- a ball of shining gas, held together by its own gravity, that emits energy into space
- a dark area on the sun's surface that is cooler than the area around it
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