Marta flies past you at 78% of the speed of light, traveling in a spaceship that would measure 50 meters from end to end if it were at rest in your reference frame.

If you measure the length of her spaceship as it goes by, how long will it be from end to end?

Vaule Unit.
The star Sirius is located 8.6 light-years from Earth (in our Earth-based reference frame). Suppose you travel from Earth to Sirius at 87% of the speed of light. During your trip, how long would you measure the distance from Earth to Sirius to be? in year