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PHOTO: NGC 1453, a giant elliptical galaxy situated in the constellation Eridanus, was one of 63 galaxies used to calculate the expansion rate of the local universe. Last year, the MASSIVE survey team determined that the galaxy is located 166 million light years from Earth and has a black hole at its center with a mass nearly 3 billion times that of the sun. (Photo courtesy of the Carnegie-Irvine Galaxy Survey)
Determining how rapidly the universe is expanding is key to understanding our cosmic fate, but with more precise data has come a conundrum: Estimates based on measurements within our local universe don t agree with extrapolations from the era shortly after the Big Bang 13.8 billion years ago.
A quarter of all known stars in the universe are thought to host a perfect planet one the same size and temperature as Earth. There are approximately a zetta of them . that s a trillion billions a one with 21 zeroes after it.
So it is presumptuous for us to assume we are the only intelligent beings in this vast cosmos. In fact, to imagine we humans are alone in space is not merely arrogant, it is scientific nonsense.
On October 19, 2017, a telescope in Maui, Hawaii s second-largest island, glimpsed the first known interstellar visitor.
Without question, this object came from a distant solar system.