Understanding Light Pollution

The video discusses the origins and types of light pollution, its impact on astronomy, the environment, wildlife, and human health. It highlights the adverse effects of excessive artificial light, such as urban sky glow, light trespass, and glare. The video also explores how light pollution disrupts ecosystems and biological clocks, and increases cancer risks. Solutions like better lighting design and regulations are proposed to mitigate these effects and restore ecological balance.

What event in 1994 led to increased awareness of light pollution in Los Angeles?

• A lunar eclipse

• A meteor shower

• A 6.7-magnitude earthquake

• A solar eclipse

What is the primary cause of the inability to see the Milky Way in many urban areas?

• Light pollution

• Air pollution

• Sound pollution

• Water pollution

Which form of light pollution is characterized by unwanted light falling into areas where it is not needed?

• Glare

• Clutter

• Light trespass

• Urban sky glow

What is the Bortle Scale used for?

• Calculating water purity

• Evaluating light pollution

• Assessing noise levels

• Measuring air quality

How does light pollution interfere with astronomical observations?

• By increasing air turbulence

• By creating bright lines in spectrographs

• By causing telescopes to overheat

• By attracting more clouds

What percentage of global electricity is used for lighting?

• 10%

• 25%

• 50%

• 75%

What is positive phototaxis?

• The neutral response of animals to light

• The repulsion of animals from light

• The attraction of plants to light

• The attraction of animals to light

How does artificial light affect the breeding patterns of some birds?

• It causes them to breed earlier

• It makes them migrate further

• It causes them to breed later

• It has no effect

What hormone's production is affected by light exposure, influencing sleep patterns?

• Melatonin

• Cortisol

• Adrenaline

• Insulin

Which city is recognized as the world's first international dark sky city?

• Flagstaff

• Paris

• Los Angeles

• New York