AI startups are increasingly encroaching on the territory of tech giants. Currently, Perplexity has launched its own AI browser Comet, and OpenAI is about to release its analog.
Developers who were creating chatbots yesterday are now building full-fledged browsers and openly challenging Google Chrome. This is happening against the backdrop of a rapid increase in the number of search queries via AI assistants — and at the same time drop in traffic to Google. The tech giant itself understands the situation: in recent months Chrome is actively acquiring AI features and the search engine is testing a new AI mode.
Comet is already available for subscribers Perplexity Max ($200/month) and a limited group of users on a waiting list. The browser has a built-in Perplexity AI search engine by default, which generates summaries instead of traditional links. In addition, Comet has a built-in Comet Assistant — an AI agent that automates routine tasks: reads mail, summarizes the calendar, manages tabs, and performs actions for the user on pages. You can call it at any time right on the website — it sees the content and reacts to it.
The future of sustained space habitation depends on our ability to grow fresh food away from Earth. The revolutionary new collaborative Moon-Rice project is using cutting-edge experimental biology to create an ideal future food crop that can be grown in future deep-space outposts, as well as in extreme environments back on Earth.
IN A NUTSHELL 🌌 Astronomers discovered a massive filament of hot gas stretching 23 million light-years, containing much of the universe’s “missing matter.” 🔭 Advanced telescopes like XMM-Newton and Suzaku played a crucial role in identifying and analyzing this elusive cosmic structure. 🕸️ The filament is part of the Cosmic Web, a network that has
The discovery of more than 15,000 kilometers of ancient riverbeds on Mars suggests that the Red Planet may once have been much wetter than previously thought.
Researchers looked at fluvial sinuous ridges, also known as inverted channels, across Noachis Terra—a region in Mars’ southern highlands. These are believed to have formed when sediment deposited by rivers hardened and was later exposed as the surrounding material eroded.
Similar ridges have been found across a range of terrains on Mars. Their presence suggests that flowing water was once widespread in this region of Mars, with precipitation being the most likely source of this water.
SPHEREx is scanning the entire sky in 102 infrared colors, beaming weekly data to a public archive so scientists and citizen stargazers alike can trace water, organics, and the universe’s first moments while NASA’s open-science philosophy turbo-charges discovery. NASA’s newest space telescope, SPHE
Serendipitous discovery of djerfisherite in Ryugu grain challenges current paradigm of the nature of primitive asteroids. A surprising discovery from a tiny grain of asteroid Ryugu has rocked scientists’ understanding of how our Solar System evolved. Researchers found djerfisherite—a mineral typically born in scorching, chemically reduced conditions and never before seen in Ryugu-like meteorites—inside a sample returned by Japan’s Hayabusa2 mission. Its presence suggests either Ryugu once experienced unexpectedly high temperatures or that exotic materials from other parts of the solar system somehow made their way into its formation. Like discovering a palm tree fossil in Arctic ice, this rare find challenges everything we thought we knew about primitive asteroids and the early mixing of planetary ingredients.
The pristine samples from asteroid Ryugu returned by the Hayabusa2 mission on December 6, 2020, have been vital to improving our understanding of primitive asteroids and the formation of the Solar System. The C-type asteroid Ryugu is composed of rocks similar to meteorites called CI chondrites, which contain relatively high amounts of carbon, and have undergone extensive aqueous alteration in their past.
A research team at Hiroshima University discovered the presence of the mineral djerfisherite, a potassium-containing iron-nickel sulfide, in a Ryugu grain. The presence of this mineral is wholly unexpected, as djerfisherite does not form under the conditions Ryugu is believed to have been exposed to over its existence. The findings were published on May 28, 2025, in the journal Meteoritics & Planetary Science.
New research utilizing data from NASA’s Parker Solar Probe has provided the first direct evidence of a phenomenon known as the “helicity barrier” in the solar wind. This discovery, published in Physical Review X by Queen Mary University of London researchers, offers a significant step toward understanding two long-standing mysteries: how the sun’s atmosphere is heated to millions of degrees and how the supersonic solar wind is generated.
The solar atmosphere, or corona, is far hotter than the sun’s surface, a paradox that has puzzled scientists for decades. Furthermore, the constant outflow of plasma and magnetic fields from the sun, known as the solar wind, is accelerated to incredible speeds.
Turbulent dissipation —the process by which mechanical energy is converted into heat—is believed to play a crucial role in both these phenomena. However, in the near-sun environment, where plasma is largely collisionless, the exact mechanisms of this dissipation have remained elusive.