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In additions to what Chris White lists, I'd like to point to the fact that, except for a few meteorites and some dust collected on the plates of satellites and rocks from Mars (and cosmic rays and a handful of neutrinos; thanks Ruslan and Kyle Oman), until now all information reaching us from the Universe — whether it is the Sun, the more distant planets, other stars, galaxies, CMB, etc, — has come to us in the form of electromagnetic radiation.

Gravitational waves is a whole new mode of gaining knowledge about the Universe. Both from objects where we also see radiation, but also for instance perhaps at some point inflation at the Big Bang, where using electromagnetic radiation we can't see further back than the CMB, 380,000 years after Big Bang (this is what the BICEP2 guys thought they saw two years ago, but it turned out to dust…).

In additions to what Chris White lists, I'd like to point to the fact that, except for a few meteorites and some dust collected on the plates of satellites and rocks from Mars, until now all information reaching us from the Universe — whether it is the Sun, the more distant planets, other stars, galaxies, CMB, etc, — has come to us in the form of electromagnetic radiation.

Gravitational waves is a whole new mode of gaining knowledge about the Universe. Both from objects where we also see radiation, but also for instance perhaps at some point inflation at the Big Bang, where using electromagnetic radiation we can't see further back than the CMB, 380,000 years after Big Bang (this is what the BICEP2 guys thought they saw two years ago, but it turned out to dust…).

In additions to what Chris White lists, I'd like to point to the fact that, except for a few meteorites and some dust collected on the plates of satellites and rocks from Mars (and cosmic rays and a handful of neutrinos; thanks Ruslan and Kyle Oman), until now all information reaching us from the Universe — whether it is the Sun, the more distant planets, other stars, galaxies, CMB, etc, — has come to us in the form of electromagnetic radiation.

Gravitational waves is a whole new mode of gaining knowledge about the Universe. Both from objects where we also see radiation, but also for instance perhaps at some point inflation at the Big Bang, where using electromagnetic radiation we can't see further back than the CMB, 380,000 years after Big Bang (this is what the BICEP2 guys thought they saw two years ago, but it turned out to dust…).

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source | link

In additions to what Chris White lists, I'd like to point to the fact that, except for a few meteorites and some dust collected on the plates of satellites and rocks from Mars, until now all information reaching us from the Universe — whether it is the Sun, the more distant planets, other stars, galaxies, CMB, etc, — has come to us in the form of electromagnetic radiation.

Gravitational waves is a whole new mode of gaining knowledge about the Universe. Both from objects where we also see radiation, but also for instance perhaps at some point inflation at the Big Bang, where using electromagnetic radiation we can't see further back than the CMB, 380,000 years after Big Bang (this is what the BICEP2 guys thought they saw two years ago, but it turned out to dust…).