EPFL Press - Page 2

  • Our Space Environment


    Cc8OSa2RCuAg-04QkLsAaRui7wAqzbYnAUuZl8K7Zg_HEpQh9KIPw_azXURGB5pndfB3d2WonQ0v_V2VP-v2GtWwQSuMeazMML0RZO35SLQe2LMcnQZG3-MXUIrCt9RivQJr61tT8nCq9KhW_1rou3qHVTk2joHQ7VmSc1fLFbrXsiOPNokNtutOnUVfiiEa9lueHEFd6Koh3ExSIesF4O7EuX3e6K1NBI3IB-MV_AxV4KyDfHkZySHjsNzOQ6ONCqHyEJx_m3hUDsyuI9-uGZtoI5EV9xJJN5yR1ZSsYrrT-tgwGMxvwcVfjjqq7-XOIFvLJnIqM-tS2iryocJ0qiBgY81ou5BmDXtQk0ZkglbXo9tUIUIeq1DMrQbWx1s7HrIhe6xztkapq2q5bdqrWEf96JLMFcmjlHxjiUTnOGoTsbDgM6LTadfxipCvUbsRGXJyFerMIjRJxSl3xkw6mVIpO_9tYrEc3iHz1UsjaekfdJ8Q8NprZYN8Dt5CHsLtjHH9WK9g-prtW6BtHBSbwTHnuL2t64srnjW9N8EtNvs=w646-h368-noWhere does space start? Where does it end? Is it unlimited? Does it have boundaries? How can we define space? A practical, yet precise definition of space is difficult to come up with. Let me give it a try, though: I would say that space includes all regions in the Universe where a free trajectory of a spacecraft, or of any natural object such as a planet, an asteroid or a comet, is possible, with no or with minimum braking force due to a drag-producing medium such as an atmosphere.

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