The possible scenario of the impact that created the Moon (a) and the following arrival of water (b) (Image Jessica J. Barnes et al.)

An article published in the journal “Nature Communications” describes a research about the water on the Moon and concluded that it was brought mostly by asteroids that struck it between 4.5 and 4.3 billion years ago. Until now, scientists generally thought that water was transported by comets but according to the international team led by Jessica Barnes of the British Open University things are different.

The Center for NEO Studies (CNEOS) website's home page

NASA has activated the Planetary Defense Coordination Office (PDCO), its program for the detection and tracking of space objects belonging to the NEO (Near-Earth Object) category, meaning the type whose orbit is close to that of Earth. This office is part of the agency’s Planetary Science Division, will be responsible for coordinating all projects connected to NEO-type asteroids and comets and will have a leading role in coordinating efforts with other agencies and governments about potential impact threats.

The Asteroid Day website's home page

Today marks the first Asteroid Day, a day dedicated to raising public awareness about the potential danger posed by asteroids and any space object whose trajectory passes through the Earth’s orbit. The date was chosen because it’s the anniversary of the Tunguska event, the destruction of a large area of ​​Siberia that took place on June 30, 1908 due to the impact of a meteorite or a piece of comet.