The hydrogen envelope of a bright comet is:
A)visible to the naked eye from Earth's surface.
B)not visible from Earth's surface because of atmospheric absorption, but it is visible to the naked eye from a spacecraft above the atmosphere.
C)created from water molecules that are broken apart by infrared radiation from the Sun.
D)visible in an ultraviolet telescope above Earth's atmosphere.

Question

The hydrogen envelope of a bright comet is:
A)visible to the naked eye from Earth's surface.
B)not visible from Earth's surface because of atmospheric absorption, but it is visible to the naked eye from a spacecraft above the atmosphere.
C)created from water molecules that are broken apart by infrared radiation from the Sun.
D)visible in an ultraviolet telescope above Earth's atmosphere.

Quizplus · Accepted Answer

The hydrogen envelope of a bright comet is not visible to the naked eye from Earth's surface due to its emission in the ultraviolet part of the spectrum, which is absorbed by Earth's atmosphere. It can be observed using ultraviolet telescopes that are positioned above the atmosphere.

The Hydrogen Envelope of a Bright Comet Is