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2024年3月11日发(作者：)

2023名校版高考英语阅读理解精

读含答案diffuse

In the endless sky, the unaided human eye should be able

to perceive several thousand stars on a clear, dark

night. Unfortunately, growing light pollution has disabled

people from the nightly view.

New citizen-science-based research throws alarming light on

the problem of “sky glow”—the diffuse illumination(漫射照明) of

the night sky that is a form of light pollution. The data came

from crowd-sourced observations collected from around the

world as part of Globe at Night, a program developed by

astronomer Connie Walker.

Light pollution has harmful effects on the practice of

astronomy but also on human health and wildlife, since it

disturbs the cycle from sunlight to starlight that biological

systems have evolved alongside. Furthermore, the loss of visible

stars is a great loss of human cultural heritage. Until relatively

recently, humans throughout history had an impressive view of

the starry night sky, and the effect of this nightly spectacle(壮观)

is evident in ancient cultures.

Globe at Night has been gathering data on star visibility since

2006. Anyone can submit observations through the Globe at

Night web application. Participants record which one best

matches what they can see in the sky without any telescopes or

other instruments.

Researchers find that the loss of visible stars indicates an

increase in sky brightness of 9. 6% per year while roughly 2% is

measured by satellites. Existing satellites are not well suited to

measuring sky glow as it appears to humans, because they can

not detect wavelengths shorter than 500 nanometers(纳米).

White LEDs, with shorter wavelengths under 500 nanometers,

now are increasingly commonly used in outdoor lighting. But

human eyes are more sensitive to these shorter wavelengths at

nighttime. Space-based instruments do not measure light from

windows, either. But these sources are significant contributors to

sky glow as seen from the ground.

“The increase in sky glow over the past decade underlines

the importance of redoubling our efforts and developing new

strategies to protect dark skies,” said Walker. “The Globe at

Night dataset is necessary in our ongoing evaluation of changes

本文标签： 阅读高考理解照明漫射

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