Astronomers mistook a car SpaceX blasted into space years ago as an asteroid. The brief mix-up highlights the sometimes difficult pursuit of tracking deep-space objects.

The journalist Kara Swisher discusses Elon Musk's goals in government — and the factors that have led to his radicalization.

The hemline index correlates the strength of the economy with women’s skirt lengths—minis in a bull market, midis in bear. In ...