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Lecture 4 - Water Worlds
Terms in this set (20)
When did the first molecules of water form in the history of the Universe?
During the explosion supernovas
Which statement is true about the distribution of water in the Solar system?
Planet Earth has much less water than average, relative on the Solar nebula
This is a representation of the solar system with celestial bodies orbiting on the ecliptic bodies orbiting on the ecliptic. Comets originate from the Kuiper belt. Where is it located?
Beyond the orbit of Neptune
Which of these planets (Mercury, Venus, Earth, Mars) do(es) not have large quantities of near-surface water?
Mercury and Venus
When did Mars completely loose it's surface water?
What statement is true about chondrites?
Chondrites are meteorites, most of them originating from the asteroid belt; Chondrites represent the material in the solar nebula, before formation of the Sun and the surrounding planets; The water content of chondrites is about a hundred times more than Earth's; ALL OF THE ABOVE
Is there water on Mars and if so, where is it?
Most of the water is found as permafrost or groundwater
Where is Valles Marineris on Mars?
Largest canyon feature on Mars
What landforms indicate the presence of surface water on Mars in the distant past?
Canyons enlarged by water erosion; Water-bearing minerals inside Valles Marineris canyon; Water mark around large, low-elevation basins; ALL OF THE ABOVE
Why did Mars loose it's water?
Interaction with solar wind breaks down water molecules, allowing hydrogen to escape; The weak gravitational attraction of Mars is not enough to maintain light particles in its atmosphere; Mars has a weak magnetic field providing only a mild protection against solar wind and cosmic rays; ALL OF THE ABOVE
What are comets made of?
Water, ice, and other dust particles
You are a Moon walker looking for water. Based on this photo of the surface of the Moon, centered on the Aristarchus crater, where would you look for water?
In the shade of the impact crater
You are to land a Lunar Module next to surface water. This is a photo of the Moon centered on the southern pole. Where do you land?
In the large crater with a shadow
As most terrestrial planets are dry, where did Earth's water come from?
From comets and asteroids during heavy bombardment; From the degassing of the mantle as the planet cooled; From volcanism; ALL OF THE ABOVE
What statement is true about the origin of water on Earth?
Comet water and Earth water have different isotopic composition; Asteroid water and Earth water have similar isotopic composition; Water vapor is the main gas expelled by volcanoes; ALL OF THE ABOVE
Where is liquid water in Jupiter's moons Europa, Ganymede, and Callisto, Saturn's moon Titan?
Below the surface in buried oceans
Which statement is true about water on Saturn?
Water is raining from its moon Enceladus; Saturn's rings are made of water ice crystals; Saturn has water vapor in its upper atmosphere; ALL OF THE ABOVE
How long did it take for Humans to evolve from the creation of the Solar system?
Is there intelligent life elsewhere in the Universe? What clues are available?
There are 100 billion planets in the Milky Way. A significant portion may be in the habitable zone; Life (as we know it) is carbon-based and carbon is widely available in the Universe; Life (as we know it) relies on water, a molecule based on widely available chemical elements hydrogen, oxygen, in the Universe; ALL OF THE ABOVE
Why is Mars a good candidate for a Human colony?
The presence of an atmosphere and large amount of subsurface water
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