This week, an old astronomical controversy is renewed as researchers present new evidence for a hidden "Planet X" in our solar system.

Discover the order of planets in the solar system. From Mercury to Neptune, explore our solar system and learn more about our cosmic home. The solar system is our cosmic neighborhood, made up of ...

An alternate explanation that fits the evidence is that Vesta was once part of a planet – but which planet that might been ...

The Earth started as a mixture of gas and dust around the Sun and grew as it collided with asteroids and dust particles.

The knock-on changes from a super-Earth – dubbed Phaeton by the researchers – were intriguing. "If it's one or two Earth masses, which is still a pretty big planet, our inner Solar System ...

Kosmos-482, a spacecraft bound for Venus in 1972, was a time capsule from the Cold War when superpowers had broad ambitions ...

Apr. 15, 2025 — A new study modeled the chemistry of TOI-270 d, an exoplanet between Earth and Neptune in ... types of planets outside of our solar system, according to a new ...

Our solar system consists of four small, rocky, inner planets (Mercury, Venus, Earth and Mars ... Astrophysical Observatory, which is part of the CfA. "This result suggests that in Jupiter ...

Indeed, other planets, dwarf planets and moons in our solar system do have seasonal cycles — and they can look wildly different from the ones we experience on Earth, experts told Live Science.

Since joining Newsweek, Melissa has been especially focused on covering under-reported women's health and social issues, and has spent a large part ... solar activity from affecting the Earth's ...

LONDON — Astronomers have found possible chemical signs of life on a distant planet outside our solar system, though they ... s atmosphere that on Earth are only produced by living organisms ...