Select the correct option for the following statements.

Special relativity says that all observers must measure the same time between events.

$q,$ The speed of light measured by a person moving at a constant speed close to the speed of light is $...$ the speed measured by a person at rest.

$q,$ The length of an object measured by a person moving along the object is $...$ the length measured by a person at rest with respect to the object.

According to a person at rest, the period of a moving clock is $....$ the period of an identical clock at rest.

If a star is $50,000$ light years away, we see it today as it was $50,000$ years ago.

If we travel at the speed of light for $1$ year $($as measured by us$),$ when we return to Earth we are $1$ year older.

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