This implies that the sodium atoms are driven away from the comet's head by radiation pressure.

Even to the naked eye, the comet's head appeared distinctly green, due to strong emissions from diatomic carbon (C).

That's the location of the comet's head."

As it moved away from perihelion, a spectacular tail developed - extending well above the horizon while the comet's head remained invisible due to the morning twilight.

Behind it, to one side and even brighter - shining through the misty glow of the first comet's head - there was a similar patch of glowing gas.

They state explicitly: "We shall argue that primitive living organisms evolve in the mixture of organic molecules, ices and silicate smoke which make up a comet's head."

The science coordinator for the Hudson River Museum, he will direct his audience in packing pebbles, minerals, ice and dry ice under a towel to create the comet's head.

Their ship was inside the spherical shell of the comet's head, was being dragged at unabated speed toward a little planet that hung at the center of this vast enclosed space.

A more definitive orbit was calculated in 1978 by Zdeněk Sekanina, based on the assumption that the comet's head was on a great circle "through the sun and inner part of the tail".

"I'll put it on the main display in a minute, but if you want to look out the right side of the cabin at the comet's head, you should be able to see the main building of the Sun Skater Resort."

On January 27, C. Todd recorded seeing the comet's head as a "diffused nebulous mass", but noted a break between the head and the tail (possibly representing what is referred to as a tail disconnection event).

The surface of the earth literally burst-with mountains collapsing, others arising, floods, hurricanes, dust storms, fires, seas boiling, rivers the color of blood, a shower of meteoric rocks, the jumping of a huge spark from the earth to the comet's head, and a rain of petroleum.