Solar System and Planetary Motion

What is true about the September equinox and the March equinox?

First a solar nebula flattens, rotates, and grows warmer. What comes next?

Our solar system formed...

What is the yearly orbit around the sun called?

Sunlight is more spread out as you move ____ the equator.

What happens after the planetesimals begin to form from the swirling disk?

What theory says 15-20 billion years ago the universe expanded after an enormous explosion?

What are the seasons caused by?

What force keeps planets and other space objects revolving around the Sun?

Summer occurs on the hemisphere of Earth that is...

Hours of daylight and nighttime are equal during...

What is the basic shape of every planet's orbit?

What is the first step of a solar system forming?

What is the line on which an object rotates?

Summer Solstice is the longest day of the year but also...

Earth _____ on its axis and _____ around the Sun.

The inner planets are mostly rocky but the outer planets are mostly...

An ellipse is a shape defined by two _____ that are the same distance from the center.

The more an ellipse is not like a circle, the more _____it is.

The time it takes a planet to travel once around the Sun is its period of _____.