Long-period comets can have orbits that can take hundreds of years before they return to the inner Solar System and sometimes come dangerously close to Earth. To search for potentially hazardous comets, astronomers have used meteor showers as a historical record. When the Earth passes through a meteoroid stream left by a comet, we see a meteor shower. From these showers, they can calculate the orbit of the comet and predict when it will come back to our neighborhood.

Comet C/2023 A3 Tsuchinshan-ATLAS survived perihelion to become a fine dusk object for northern hemisphere observers.

In 2005 astronomers found a pulsar rotating at 716 times a second. Now a team studying an X-ray binary has found another neutron star spinning at that rate.

Sungrazer C/2024 S1 ATLAS breaks apart at perihelion.

The TRAPPIST-1 system is exciting because of several Earth-sized worlds within the habitable zone of a red dwarf star, but it's also a dangerous environment, with powerful superflares sweeping past the planets. How would the hardiest Earth life handle that kind of environment? Researchers exposed two types of hardy Earth bacteria to TRAPPIST-1 level flares and found that both could handle it, even without any protective shielding. Life is surprisingly durable.

There are a few telescopes under development that could reveal evidence of life on exoplanets. One is the Large Interferometer for Exoplanets, under consideration by the European Space Agency. This constellation of telescopes should be able to detect atmospheric biosignatures on nearby terrestrial planets. Recently, mission planners developed a preliminary database of targets that LIFE could point to, with the best chances of finding inhabited worlds.