The Sun seems unchanging, but solar flares, prominences, and sunspots often pop up and disappear. Safely observing the Sun can be both fun and rewarding.

The origin of Earth's water is a long-standing scientific question, with differing isotopic ratios of deuterium to hydrogen (D/H) in Earth's oceans compared to the early solar system suggesting ...

The First Quarter Moon is scheduled for October 28 at 12:21 P.M. EDT, presenting its terminator halfway across the visible lunar disk. During this lunar phase, observers can distinguish maria and ...

UPDATE 8/28/24: After pushing back the initial launch from Tuesday to Wednesday this week to check a helium leak in the launch system, SpaceX once again delayed Polaris Dawn’s launch, citing poor ...

Light pollution reduction (LPR) filters function by selectively blocking specific wavelengths of light emitted by certain artificial sources, such as high-pressure sodium streetlights, which ...

(Editor’s note: The author of this article is one of the authors of a new paper on Planet Nine, which you can read here. It has been accepted for publication in The Astrophysical Journal Letters.) In ...

Mars was a very different place as a young planet. Liquid water dotted the Red Planet’s landscape with lakes and rivers. But the planet’s climate changed drastically in the past few billion years.

After a successful launch last week aboard a SpaceX Falcon 9 rocket, Intuitive Machines’ IM-2 mission landed on the Moon on March 6 shortly after 11:30 a.m. EST. The craft is transmitting back to its ...

Star formation begins with protostars in cold molecular clouds, where gravitational contraction precedes nuclear fusion, and their early evolutionary stages are best characterized through ...

The speed of light is a fundamental constant, approximately 299,792,458 meters per second. It's the same for all observers and hasn't changed measurably over billions of years. Nothing can travel ...

China is preparing for the Shenzhou-21 crewed mission, targeting the Tiangong space station. The mission's launch, utilizing a Long March-2F carrier rocket from the Jiuquan Satellite Launch Center, is ...

Several planets, including Mercury, Mars, Venus, Uranus, Neptune, Saturn, and Jupiter, are visible this month. Saturn's moon Titan will cast its shadow on Saturn twice during July. Neptune will be ...