[2308.08689] Are we visible to advanced alien civilizations?

We considered the question of how our artificial constructions are visible to advanced extraterrestrial civilizations. Taking the universality of the laws of physics, we found that the maximum distance where the detection is possible is of the order of 3000 ly and under certain conditions Type-II advanced alien societies might be able to resolve this…

RNA molecule uracil found in asteroid Ryugu samples


Researchers have analyzed samples of the asteroid Ryugu collected by the Japanese Space Agency’s Hayabusa2 spacecraft and found uracil, one of the informational units that make up RNA, the molecules that contain the instructions for how to build and operate living organisms. Nicotinic acid, also known as Vitamin B3 or niacin, which is an important…

Asteroid lost 1 million kilograms after collision with DART spacecraft

Asteroid lost 1 million kilograms after collision with DART spacecraft
Studies reveal final moments before NASA probe crashed into an asteroid. (Nature)

Last September, NASA’s Double Asteroid Redirection Test (DART) spacecraft smashed into an asteroid, deliberately altering the rock’s trajectory through space in a first test of planetary defence.

Now scientists have deconstructed the collision and its aftermath — and learnt just how successful humanity’s punch at the cosmos really was.DART, which was the size of a golf cart, collided with a Great Pyramid-sized asteroid called Dimorphos. The impact caused the asteroid’s orbit around another space rock to shrink — Dimorphos now completes an…

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