State the three regions of the electromagnetic spectrum that have wavelengths longer than visible light.

1. ____________________________

2. ____________________________

3. ____________________________

Electromagnetic radiation from a star travels through space at a speed of $$\begin{gathered} 3.0\times 10^8 \\ textm/s \end{gathered}$$. The radiation takes $$\begin{gathered} 750 \\ texts \end{gathered}$$ to reach an orbiting planet.

Calculate the distance from the star to the planet.

Stars form from interstellar clouds of gas and dust.

Describe how gravitational forces and temperature changes lead to the formation of a protostar from a nebula.

Explain how a protostar transitions into a stable main-sequence star, and how the forces within this star are balanced.