「汽油……大多數州現在每加侖低於2.3美元，某些地方是每加侖1.99美元」
Let’s look at some examples.。关于这个话题，PDF资料提供了深入分析
。新收录的资料是该领域的重要参考
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The observations also offer clues about the asteroids themselves. Researchers estimate that Didymos is relatively dense, while Dimorphos appears much lighter and more loosely packed. That difference supports the idea that Dimorphos may have formed from pieces of the larger asteroid long ago.，这一点在新收录的资料中也有详细论述