And God made two great lights; the greater light to rule the day, and the lesser light to rule the night; he made the stars also.

And God set them in the firmament of the heaven to give light upon the earth.

And to rule over the day and over the night, and to divide the light from the darkness: and God saw that it was good.

And the morning and the evening were the fourth day.

• What evidence do we have that stars form within dark interstellar clouds?
• What triggers the collapse of interstellar clouds to form stars?
• What do newly formed stars look like?
• Why do we think that the Sun was once surrounded by a nebula of gas and dust?
• How did the planets form from a thin cloud of gas and dust?
• What evidence do we have that there are other planetary systems?