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After decades of searching, astronomers have definitively detected helium hydride, the first molecule to form in the early universe.

The post Astronomers Find Universe’s First Molecule appeared first on Sky & Telescope.

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Astronomers have found a way to turn quasars into standard candles, with potentially far-reaching implications for the nature of mysterious dark energy.

The post What Quasar Cosmology Can Teach Us About Dark Energy appeared first on Sky & Telescope.

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Nearly 11 billion years ago, the universe churned out stars at a rate 10 times greater than today. And yet all the starlight in the cosmos appears no brighter on the sky than a 60-watt light bulb seen from miles away.

The post Starlight Tally Reveals Cosmic History of Star Formation appeared first on Sky & Telescope.

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HaloSat, a mini-satellite recently deployed from the International Space Station, is on the hunt for the universe's missing matter.

The post HaloSat: A Small Satellite for a Big Question appeared first on Sky & Telescope.

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Astronomers have conducted the best, galaxy-scale test of general relativity yet, and it rules out some (but not all) theories of modified gravity.

The post Best Test of General Relativity on Galaxy Scales appeared first on Sky & Telescope.

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A recent experiment to better understand the nature of dark matter constrains a possible "fifth force" of nature to almost zero.

The post Pulsar Limits “Fifth Force” Interactions with Dark Matter appeared first on Sky & Telescope.

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A new method of measuring star formation in the earliest galaxies finds that they’re producing more massive stars than expected — a result that could affect our understanding of how galaxies grow their stars.

The post Too Many Massive Stars in Universe’s Youngest Galaxies appeared first on Sky & Telescope.

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New observations suggest that stars were forming just 250 million years after the Big Bang — a record-breaker that will likely open a new line of cosmological inquiry.

The post Early Star Formation Presents New Cosmic Mystery appeared first on Sky & Telescope.

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Stephen Hawking’s last paper on cosmology, published posthumously, might solve the problem of eternal inflation, a theory that suggests our cosmos is but one in a sea of infinite universes.

The post Hawking Takes on the Infinite Multiverse appeared first on Sky & Telescope.

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A simple experiment has detected a signal from the first stars forming just 180 million years after the Big Bang. The observations have intriguing implications for the nature of dark matter.

The post Primordial Chill Hints at Dark Matter Interactions in Early Universe appeared first on Sky & Telescope.

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