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Most Popular Questions

Below are listed the top 10 most frequently read Ask a Rocket Scientist articles during the past month.

Do the planets and moons in our solar system tend to orbit and rotate in the same plane? If so, what would be the cause of such uniformity? Why do all the planets orbit the Sun in the same direction?
What were the ancient Greek names for the original nine planets?
I'm confused by the way the record for largest plane is determined. I've read about the 747-400, An-225, Spruce Goose, and Bristol Brabazon. ... Could you please define the records, if any, that these aircraft hold with EXACT wording to the particular record?
Can you explain why a golf ball has dimples? If dimples reduce drag, why don't we see this surface feature on other aerodynamic shapes like airplane wings?
Has the United States or any other country ever had a plane carrying a nuclear bomb crash? Has a nuclear weapon ever been lost?
I've seen pictures of engine wreckage at the Pentagon after 9/11. Your site says the engine of a 757 is over 6 feet across but this piece is way smaller than that. Does it prove that whatever hit the Pentagon was not a 757 and the government is lying about it?
I like your article about the world's biggest plane but wonder about helicopters too. How are they ranked? By weight, length, or rotor size? Is the CH-53 the biggest in the world or something else?
Does the Joint Strike Fighter have an internal gun? What are the weapon loads? It does not seem to have as much internal space as the F-22.
What is the fastest jet on earth?
What is the speed of sound? How fast is Mach 1? What is the sound barrier? How fast do you have to go to break the sound barrier? How fast is the speed of sound at ground level? What does the term Mach number mean? What is the speed of an aircraft traveling at Mach 3 at an altitude of 30,000 feet? What is subsonic speed?

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