copper-yellow flame, and, although the sun had set two hours ago, the Earth was lit as with the glow of a thunderous dawn.

In Mayfield, Ken Maddox walked slowly along Main Street, avoiding collisions with other people whose eyes were fixed on the object in the sky. Ken had spent scores of hours observing the comet carefully, both by naked eye and with his 12-inch reflecting telescope. Still he could not keep from watching it as he picked his way along the street toward the post office.

The comet had been approaching Earth for months, growing steadily to bigger proportions in the sky, but tonight was a very special night, and Mayfield was watching with increased awe and half-dread--as were hundreds of thousands of other communities around the world.

Tonight, the Earth entered the comet's tail, and during the coming winter would be swept continuously by its million-mile spread.

There was no visible change. The astronomers had cautioned that none was to be expected. The Earth had passed through the tails of comets before, although briefly, and none of the inhabitants had been physically aware of the event.

This time there was a difference. As intangible as a mere suspicion, it could yet be felt, and there was the expectancy of the unknown in the air.Ken prided himself on a scientific attitude, but it was hard not to share the feelings of those around him that something momentous and mysterious was taking place this night. There would be no quick passage this time. Earth would lie within the tail for a period of over four months as they both made their way about the sun. Such close-lying orbits had never occurred before in the known history of the world.

"It's frightening, isn't it?" Ken was aware that he had stopped at the edge of a crowd in front of Billings Drugstore, and beside him Maria Larsen was staring intently upward as she spoke. She was a small, blonde girl with intense blue eyes. Ken smiled confidently and looked down at her. "No," he said. "It's a beautiful thing. It's a kind of miracle that we should be alive when it happened. No human beings have ever seen such a sight before."

Maria shivered faintly. "I wish I could feel that way. Do you think it will get any bigger?"

"Yes. It will not reach its closest approach for over three months, yet. Its approach is very slow so we won't notice much change."

"It is 

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