Gadget

ChatGPT vs Gemini vs Claude: Ever since these artificial intelligence (AI) chatbots have been released, they have been regularly compared against each other. Looking at them at the surface level, you might think that there is not a lot separating these AI bots from one another. However, a closer inspection would tell you that each of them thrives in some specific tasks, while struggling in others.

The Miralga impact crater in Western Australia, once thought to be Earth’s oldest at 3.5 billion years, has now been redated to after 2.7 billion years ago. With a revised diameter of just 16 kilometers, the structure no longer supports theories of early crust or life formation, but remains scientifically valuable for studying Mars-like planetary geology.

NASA launched its twin TRACERS satellites on July 23, 2025, to study how solar wind causes magnetic reconnection in Earth’s magnetosphere. However, a power issue on one spacecraft, SV1, has caused intermittent communication. Engineers believe the issue relates to sunlight availability on its solar panels and plan recovery efforts in August. Meanwhile, the second satellite, SV2, is healthy and undergoing final instrument commissioning. Once ready, SV2 will begin its science mission independently, while NASA works to recover SV1 and resume full dual-satellite operations critical to the mission’s original research goals.

A new study proposes that life may exist far from sunlight in a “radiolytic habitable zone” deep beneath the icy surfaces of Mars, Europa, and Enceladus. Cosmic rays, which can penetrate rock and ice, break water molecules apart to release hydrogen, oxygen, and energy-rich electrons. These can fuel microbes in subsurface water, much like bacteria living deep below Earth. Simulations show Enceladus has the strongest potential for such life, followed by Mars and Europa. This expands the search for life to darker, colder environments—even on rogue planets adrift in space.

Two new studies from UC Santa Cruz propose that dark matter may have originated from a hidden mirror world or been radiated into existence by the universe’s expanding cosmic horizon. These theories, rooted in established physics, challenge traditional models and suggest dark matter could exist without interacting with ordinary matter, redefining one of modern science’s greatest mysteries.

After a 22-day period of solar calm, the Sun unleashed three M-class solar flares on August 3–4, 2025, all originating from active sunspot region AR 4168. These moderate flares released intense radiation, capable of briefly disrupting high-frequency radio signals and potentially sparking auroras at high latitudes. Scientists also detected likely coronal mass ejections, which may graze Earth.

In a recent study published on July 24 via arXiv, astronomers from Wuhan University have detailed the powerful X-ray outburst of the Be/X-ray binary system RX J0440.9+4431. Using China’s Insight-HXMT satellite, the team tracked the event from its eruption in December 2022 through March 2023.

The James Webb Space Telescope has re-imaged part of Hubble’s Ultra Deep Field, revealing over 2,500 galaxies in stunning infrared detail. Using its NIRCam and MIRI instruments, Webb observed faint galaxies dating back to just a few hundred million years after the Big Bang. This is part of the JADES survey, which includes the deepest mid-infrared image ever taken and redshift measurements for 178 early-universe galaxies.

At 3:46 a.m. EDT, Crew-11 entered the International Space Station after the SpaceX Dragon hatch opened, officially joining Expedition 73. The arrival, streamed live on NASA+, highlighted ongoing international collaboration and commercial spaceflight efforts. NASA’s social platforms shared visuals of the crew’s welcome, reinforcing transparency and public engagement in human space exploration.

If you’re transitioning from the sub-Rs. 10,000 segment and don’t want to invest a huge amount on a device which, more often than not, gets outdated within a few years, then we curated a list of the top smartphones under Rs. 15,000 in India to help you make an informed buying decision.