Stars

NASA’s Transiting Exoplanet Survey Satellite (TESS) has discovered three worlds orbiting a star located a mere 73 light-years from Earth. The exoplanets are a tempting target for scientists hoping to understand how planets form, and may even be a future hunting ground for E.T.

Human lives make it impossible to witness the full life cycles of stars, planets and galaxies. But sometimes, if we’re lucky, astronomers might be able to catch crucial moments playing out before their eyes. Now a team has done just that, watching as a red giant star goes through its death throes.

Astronomers have discovered a weird star system that appears to be dimming completely at random, and none of the usual explanations seem to fit.

Three new, roughly Earth-sized exoplanets have been found orbiting a nearby star. Named L 98-59b, c and d, the small worlds were spotted by NASA’s TESS, as part of a larger haul of data that finally brings the total tally past the milestone of 4,000 exoplanets discovered to date.

Last year astronomers discovered a gigantic “ghost” galaxy, named Antlia 2, orbiting the Milky Way. Now, new research led by Rochester University has found that the bizarre galaxy may have been involved in a hit-and-run that left the Milky Way with a wobbly galactic disc.

Dark matter is the mysterious substance that’s believed to permeate the universe, and the discovery last year of a galaxy with no dark matter was quite surprising. But now, astronomers have examined the oddball galaxy a bit closer – and found that it’s not so special after all.

New research suggests some asteroids could actually be alien, captured during close flybys with other star systems. These close encounters could also explain objects like Oumuamua and might even provide an alternative to the “Planet Nine” hypothesis.

A bombardment of cosmic rays from ancient supernovae may have triggered a series of events that encouraged early human ancestors to walk upright, according to a new study. The cosmic explosion could have helped trigger a shift in Earth’s environment that forced humanity’s fore bearers to adapt.

Another 18 exoplanets have been added to the haul, but the difference this time is that all of them are roughly Earth-sized – much smaller than the Neptune-sized average found so far. The discovery was made in old data, using a new and more sensitive algorithm.

The cosmos is full of strange things, like planets made of diamond, mysterious radio bursts and quasars that shine like 600 trillion Suns. Now astronomers have spotted a bizarre star that may prove to be one of the rarest objects ever, with maybe as few as five or six of them in the galaxy.

Hubble has been photographing the cosmos for 30 years now, but it still manages to surprise us with some absolutely breathtaking shots. Case in point, the latest image shows the two-faced galaxy NGC 4485, which still bears the stunning scars of a close call with another galaxy millions of years ago.

Scientists have been poring over the Gaia galactic census of Milky Way stars for about a year. Now, a team of researchers has found evidence of a “stellar baby boom,” a short period of time in which more than half the stars in the thin disc were born.