Unit 2 Earth In Space

Front

What is the main characteristic of the universe since its beginning?

Back

The universe has been expanding.

Front

What are daily changes in ocean water called?

Back

Tides.

Front

What moon phase occurs during a solar eclipse?

Back

New moon.

Front

What does redshift in galaxies indicate?

Back

Galaxies that are redshifted are moving away from us.

Front

What causes tides?

Back

Tides are caused by the difference in the gravitational force of the sun and moon across the Earth.

Front

Define 'galaxy'.

Back

A galaxy is a massive system that consists of stars, stellar remnants, interstellar gas, dust, and dark matter, bound together by gravity.

Front

What is the difference between a solar eclipse and a lunar eclipse?

Back

A solar eclipse occurs when the moon passes between the Earth and the sun, blocking the sun's light. A lunar eclipse occurs when the Earth passes between the sun and the moon, casting a shadow on the moon.

Front

What is the role of gravity in the formation of tides?

Back

Gravity pulls the water in the oceans towards the moon and the sun, creating bulges that result in high and low tides.

Front

What is the significance of the 'Goldilocks Zone'?

Back

The Goldilocks Zone is the habitable zone around a star where conditions are just right for liquid water to exist on a planet's surface.

Front

What is the difference between a planet and a star?

Back

A planet is a celestial body that orbits a star and does not produce its own light, while a star is a massive celestial body that generates light and heat through nuclear fusion.