When Worlds Collide is a 1933 science fiction novel co-written by Edwin Balmer and Philip Wylie; they also co-authored the sequel After Worlds Collide (1934). It was first published as a six-part monthly serial (September 1932 through February 1933) in Blue Book magazine, illustrated by Joseph Franké. Synopsis Sven Bronson, a Swedish astronomer working at an observatory in South Africa, discovers a pair of rogue planets, Bronson Alpha and Bronson Beta, which will soon enter the Solar System. In eight months, they will pass close enough for gravitational forces to cause catastrophic damage to the Earth. Sixteen months later, after swinging around the Sun, Bronson Alpha (a gas giant) will return to pulverize the Earth and depart. Bronson Beta (discovered to be Earth-like and potentially habitable) may remain and assume a stable orbit. Scientists led by Cole Hendron work desperately to build an atomic rocket to transport enough people, animals and equipment to Bronson Beta to save humanity from extinction. Various countries do the same. The United States evacuates coastal regions in preparation for the first encounter. As the planets approach, observers see through their telescopes cities on Bronson Beta. Tidal waves sweep inland at a height of , volcanic eruptions and earthquakes add to the deadly toll, and the weather runs wild for more than two days. Bronson Alpha grazes and destroys the Moon. Three men take a floatplane to check out conditions across the United States and meet with the President in Hutchinson, Kansas, the temporary capital of the United States. All three are wounded fighting off a mob at their last stop, but manage to return with a precious sample of an extremely heat-resistant metal one of them had noticed. This solves the last remaining engineering obstacle: no material had been found before to make rocket tubes capable of withstanding the heat of the atomic exhaust. Five months before the end, desperate mobs attack the camp, killing over half of Hendron's people before they are defeated. With the rocket tube breakthrough, the survivors are able to build a second, larger ship that can carry everyone left alive (instead of only 100 of the roughly thousand people Hendron had recruited). The two American ships take off, but lose contact with each other. Other ships are seen launching from Europe; the French ship's tubes melt, causing it to crash. The original American ship makes a successful landing, but it