"We didn't know what exactly to expect from these first observations – the sun's poles are literally terra incognita,” Sami ...

Astronomers describe Mercury as an "inferior planet", because its orbital path around the sun is much closer than that of ...

We call this plane the ecliptic, which is defined specifically by Earth’s orbit around our star. So, Earth’s orbit is tilted 0° from the ecliptic because it defines the ecliptic.