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Mars is the fourth planet from the Sun and the second-smallest planet in the Solar System after Mercury . In English, Mars carries a name of the Roman god of war , and is often referred to as the “Red Planet“ because the iron oxide prevalent on its surface gives it a reddish appearance that is distinctive among...

A meteor shower is a celestial event in which a number of meteors are observed to radiate, or originate, from one point in the night sky. These meteors are caused by streams of cosmic debris called meteoroids entering Earth’s atmosphere at extremely high speeds on parallel trajectories. Most meteors are smaller than a grain of sand, so almost...

NASA’s Apollo 11 mission comes to life in 19,000 hours of newly available audio. Over the eight-day, 3-hour Apollo 11 mission, astronauts Neil Armstrong, Buzz Aldrin and Michael Collins stayed in constant communication with mission control and supporting teams. The back-and-forth conversations, which took place over what are called communication “loops,” were released to the media, because NASA...

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Acknowledgements

All authors must admit to a dependence on the work of others. We are no exception. We owe a huge debt of gratitude to all the publications and reference sources that we have consulted and adapted for educational purposes. It would also have been quite impossible to have produced the material on this website without adapting a variety of authentic resources that we have regularly referred to. While every effort has been made, it has not always been possible to identify and cite the sources of all the material used or to trace all copyright holders. We will be happy to omit any contents or include any appropriate acknowledgements when they are brought to our notice.

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