NASA scientists find evidence of liquid water on Mars, boosting hopes of finding life beyond Earth

The video discusses recurring slope linea (RSL) on Mars, which are dark stains that appear when temperatures rise above -10°F and vanish in colder seasons. Scientists discovered perchlorate salts on Mars using infrared light, which help keep water liquid by lowering its freezing point. One theory for the water flow is deliquescence, where salts absorb moisture from the air.

What are the dark stains on Mars's crater walls called?

• Mars water trails

• Dark slope streaks

• Martian streaks

• Recurring slope linea

At what temperature do the recurring slope linea appear on Mars?

• Below 0 degrees Fahrenheit

• Above 0 degrees Fahrenheit

• Below minus 10 degrees Fahrenheit

• Above minus 10 degrees Fahrenheit

How were perchlorate salts discovered on Mars?

• By analyzing infrared light

• Using telescopic observations

• Through satellite imagery

• By sending a rover

What is the role of perchlorate salts in maintaining liquid water on Mars?

• They absorb water from the atmosphere

• They increase the boiling point of water

• They provide heat to melt ice

• They lower the freezing point of water

What is deliquescence in the context of Mars?

• A geological formation process

• A process where salt absorbs water from the air

• A method of water purification

• A type of Martian weather pattern