Science MCQs

The Corona the Sun's outer atmosphere becomes visible as a pearly white crown during a total solar eclipse.

A star's color is directly related to its surface temperature (e.g. red=cool blue=hot).

The mass of the Earth is approximately 6 x 10^24 kilograms.

Gravity pulls matter together converting gravitational potential energy into heat which eventually triggers nuclear fusion.

At the center of the Earth gravitational forces from all sides cancel each other out resulting in a net force of zero and thus weightlessness.

Stellar parallax is the apparent shift in a star's position caused by the Earth's movement around the Sun.

Star-forming nebulae are predominantly composed of hydrogen and helium the primary fuels for stars.

Astronauts are in a state of continuous freefall towards Earth which creates the sensation of weightlessness.

On the equinoxes (around March 21st and September 23rd) the Sun is directly above the equator resulting in nearly equal day and night worldwide.

In polar regions during summer the tilt of Earth's axis means the Sun remains visible above the horizon for 24 hours.