The lead section of a Wikipedia article is the section before the first heading. The table of contents, if displayed, generally appears between the lead section and the first subheading.
Rule of thumb: If a topic deserves a heading or subheading, then it deserves short mention in the lead.
The lead section should contain up to four paragraphs, depending on the length of the article, and should provide a preview of the main points the article will make, summarizing the primary reasons the subject matter is interesting or notable. The lead should be capable of standing alone as a concise overview of the article, should be written in a clear and accessible style, should be carefully sourced like the rest of the text, and should encourage the reader to want to read more. The following table has some general guidelines for the length of the lead section:
Hi, welcome to my user page. I'm a vandalism patroller, reviewer, rollbacker and new page patroller so if you see that any mistakes have been made, feel free to contact me by using my user talk page to notify me.
Any new users who have questions feel free to contact me here.
5 albert square has given you a kitten! Kittens promote WikiLove and hopefully this one has made your day better. Kittens must be fed three times a day and will be your faithful companion forever! Spread the WikiLove by giving someone else a kitten, whether it be someone you have had disagreements with in the past or a good friend.
--5 albert square (talk) 21:24, 11 September 2010 (UTC)
Spread the goodness of kittens by adding {{subst:Kitten}} to someone's talk page with a friendly message!
The Double Asteroid Redirection Test (DART) was a NASA space mission aimed at testing a method of planetary defense against near-Earth objects. The target object, Dimorphos, is a 160-meter-long (525-foot) minor-planet moon of the asteroid Didymos. DART was launched on 24 November 2021 and successfully collided with Dimorphos on 26 September 2022 while about 11 million kilometers (6.8 million miles) from Earth. The collision shortened Dimorphos's orbit by 32 minutes and was mostly achieved by the momentum transfer associated with the recoil of the ejected debris, which was larger than the impact. This video is a timelapse of DART's final five and a half minutes before impacting Dimorphos, and was compiled from photographs captured by the Didymos Reconnaissance and Asteroid Camera for Optical navigation (DRACO), the spacecraft's 20-centimeter-aperture (7.9-inch) camera, and transmitted to Earth in real time. The replay is ten times faster than reality, except for the last six images, which are shown at the same rate at which the spacecraft returned them. Both Didymos and Dimorphos are visible at the start of the video, and the final frame shows a patch of Dimorphos's surface 16 meters (51 feet) across. DART's impact occurred during transmission of the final image, resulting in a partial frame.Video credit: NASA / Johns Hopkins APL
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