Science Term 4 Defintions

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Answer

The star at the center of our solar system, providing heat and light.

A massive ball of gas undergoing nuclear fusion, emitting light and heat.

A system of billions of stars, gas, and dust bound by gravity.

A celestial body orbiting a star, large enough to be spherical and clear its orbit.

The curved path of one object around another due to gravity.

A star and all the objects gravitationally bound to it, including planets.

A natural satellite orbiting a planet.

A star's brightness as it would appear from a standard distance.

The theory that the universe began from an extremely dense and hot state and has been expanding.

The faint radiation left over from the Big Bang.

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Answer

The stretching of light waves, making them appear redder, indicating an object is moving away.

The compression of light waves, making them appear bluer, indicating an object is moving closer.

The observation that galaxies move away faster as their distance increases.

The regions of Earth that support life.

The solid, rocky part of Earth, including the crust, mantle, and core.

All the water on Earth's surface, underground, and in the atmosphere.

The layer of gases surrounding Earth.

Long-term shifts in temperature, weather patterns, and ecosystems.

The trapping of heat in Earth's atmosphere by greenhouse gases.

The variety of life in a particular habitat or the entire planet.