根据第三段,Dam left Earth nore than seven years ago on a trip to explore Ceres and another dwarf planet, called vesta(什神星).曙光号是?年前离开地球的,其 程是为了探索谷神星和另一颗名叫灶神星的矮行星。由此可以推算曙光号是2008年发射的,故选A。 2. A;考查细节理解。根据文中倒数第四段,"...
There's also a dwarf planet named Ceres in the asteroid belt.The rest aren't very large.The Earth is the only planet that we know of with life on it, but universe is a big place. Much of our solar system is still a mystery, and there is still plenty to explore.How long does it...
The Earth's Moon is believed to have been created in the early solar system by a planet called Theia crashing into Earth. There are two billion potential stars in our galaxy that could harbour life according to scientists, 10. In addition to the ones that can, there will be a lot ...
Which is preceded by an underlying "water ice mantle" that has a rocky based core. That when this dwarf planet-(also named proto planet), is exposed to warmer conditions-(for instance in passing in it's rotational orbit around our sun), that this "dirty water ice mantle" produces ...
The part underlined is the geophysical planet definition. I said this in a previous post. The IAU has included the geophysical planet definition as part of their dynamical definition. There are no geophysical definitions that are the same as the IAU definition. The geophysical planet definition pro...
Why Is Pluto Not a Planet? When Pluto was discovered beyond Neptune in 1930, it was called a planet. However, in the 1990s, astronomers began to realize there are many other bodies in the regions of the solar system beyond Neptune. These include Eris, which was discovered in 2005, and ...
There is nothing wrong with the dynamical concept and data used to identify the dynamically dominant class of bodies that the IAU has identified as planets. The problem is they should have applied a compound term such as the often used term "principal planet" for the class of objects orbiting...
There is a fair chance we will have dozens of dwarf planets discovered in the next couple of decades. geirsaid: By the 'clear the orbit criteria', Earth wasn't even a planet until after bits of Theia became a moon (planet-sized moon). It's transitory and situational. ...
Was there a planet between Mars and Jupiter? Is Mars Earth's sister planet? Is Mars still a planet? Is Mars an exoplanet? What is the size of the planet Mars? Is Venus a dwarf planet? Is Venus the smallest planet? Is Ceres a dwarf planet?
Second is the recycling of those resources so they don't get used up too quickly. In a closed-loop habitat, unrecycled waste is costly and can diminish the habitat over time because it means there is progressively less of any given resource to go around. It can also pollute the environmen...