Can we mask the Earth from hostile aliens ?

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A lot of our search for Earth-like planets (and, by extension, for life as we know it) hinges on transiting planets. These are planets that pass in front of their host star in such a way that the transit is visible from our perspective. The movement of the planet in front of the host star makes the light from that star dim or flicker, and we can use that to determine all sorts of things about distant worlds — including how suitable they may be for life.

[Study: Maybe we can’t find aliens because they’ve all died already]

Some scientists have suggested that we should hope that Earth is a transiting planet from the perspective of some other world that hosts intelligent life. In other words, our best shot at finding aliens might be hoping that they're using exactly the same methods of planetary detection that we are, and that they can see the passage of Earth in front of the sun with their telescopes. If we made a lot of noise in the direction of those theoretical planets, we might get their attention faster.

Or we could point lasers at them instead.