Planet Nine might not exist, many astronomers now think

Planet Nine is a theoretical, undiscovered giant planet in the mysterious far reaches of our solar system. The presence of Planet Nine has been hypothesized to explain everything from the tilt of the sun’s spin axis to the apparent clustering in the orbits of small, icy asteroids beyond Neptune. But does Planet Nine actually exist? …

The Sun is less active than sibling stars, study shows – here’s what that could mean

All stars emit varying amounts of light over time – and the Sun is no exception. Such changes in starlight can help us understand how habitable any planets around other stars are – a very active star may bombard its planets with harmful radiation. Now a new study, published in Science, shows that the Sun …

The oldest material on Earth has been found in a meteorite and it is way older than the Solar System!

Scientists have found the oldest material on Earth in a 7 billion-year-old meteorite – a space rock that is way older than the Earth and even older than our solar system! For comparison, the age of Earth is approximately 4.54 billion years, with an error range of about 50 million years. The Sun is about …

The best view yet of 2I/Borisov, the first confirmed interstellar comet by the Hubble Space Telescope

On October 12, 2019, the NASA/ESA Hubble Space Telescope provided astronomers with their best look yet at the first confirmed interstellar comet – the 2I/Borisov (originally designated C/2019 Q4).