Earth-Sun-Moon Seasons Solar System Stars Laws and Theory

This is when the Moon blocks out the Sun.

Solar Eclipse

This is the property whereby the Moon rotates on its axis at the same rate as it revolves around the Earth.

Synchronous Rotation

This is when the Moon is at its farthest point from Earth.

Apogee

This is when the Earth passes between the Moon and the Sun and blocks the light of the full Moon.

Lunar Eclipse

This is when the Moon is at its closest point to the Earth.

Perigee

This is when the northern hemisphere has its minimum daylight hours; at or near Dec. 21.

Winter Solstice

This is when the lengths of day and night are equal.

Vernal or Autumnal Equinox

This is Earth’s position around June 21 st, when daylight is maximum in the northern hemishpere.

Summer Solstice

Earth’s 23.5 degree tilt causes this.

Seasons

This is when there is continual darkness above the arctic circle.

Winter (December 21 st )

This is the only planet with liquid water.

Earth

This solar system object was demoted from its planetary status and is now classified as a dwarf planet.

Pluto

These are bodies of interplanetary debris that orbit the Sun mostly between the orbits of Mars and Jupiter.

Asteroids

These are icy bodies with highly eccentric orbits that mostly orbit in the outer reaches of the solar system.

Comets

This is the planet right next door that has a thick carbon dioxide atmosphere and sulfuric acid precipitation.

Venus

The Hertzsprung-Russel (H-R) diagram classifies stars using their properties of brightness and this.

Temperature (Color)

This is the cloud of gas and dust in space from which stars are made.

Nebula

This is the combining of lightweight nuclei into heavier nuclei. This process takes place in the interior of stars.

Fusion

This is the number of stars in our solar system.

One

Most of the light emitted by the Sun comes from this region.

Photosphere

This happens when an object is moving away from the observer.

Red Shift

This is the change in position of distant objects due to a change in the position of the observer.

Parallax

This is the movement of a planet in an opposing direction across the sky.

Retrograde Motion

This is the name of the Moon formation theory that is most widely accepted.

Impact Theory

This is the theory that states the universe began as a point and has been expanding ever since.

Big Bang Theory