NASA’s IMAP mission will explore the heliosphere and study how it shields Earth from cosmic radiation and space weather.

The universe is about 13.8 billion years old. Venus is the hottest planet due to a runaway greenhouse effect. Elliptical galaxies are the most common type. Stars produce energy through nuclear fusion.

The workings of our solar system are roughly the same now as they have been for millions of years. Moons circle their planets, the planets circle the sun, the sun’s magnetic fields and sunspots wax ...