HD 20794d orbits its star with two other super-Earth planets, designated b and c, which orbit their star every 18.3 and 89.6 days, respectively. These were discovered in 2011 by a team of Geneva ...

These changes in appearance are the phases of the moon. As the moon orbits Earth, it cycles through eight distinct phases. The four primary phases of the moon (new moon, first quarter, full moon ...

Kareta and members of his team at Lowell Observatory, who study near-Earth asteroids on close orbits, were already observing the object before anyone dubbed it a potential mini-moon. To ensure ...

Kareta and members of his team at Lowell Observatory, who study near-Earth asteroids on close orbits, were already observing the object before anyone dubbed it a potential mini-moon. To ensure that ...