The space probe Voyager 1, launched in 1977, is 23.3 billion km from Earth. In hours, calculate the time it takes signals from Voyager 1 to reach Earth.
The planet Theia is 3.5 x 10¹¹ m away from its star. On the surface of Theia, light from the star has average intensity 250 W/m² .
Calculate the maximum magnetic field strength in the starlight on Theia.