See Mars' Memorial Day Close-Up: Watch Live on Slooh Webcast

Three views of Mars, one by an amateur astronomer, another from Mars Express at Mars, and a third from the Hubble Space Telescope
Three views of Mars at its best for 2016 take center stage in this collage of images by amateur astronomer Dylan O’Donnell (at left as seen from his home-built backyard observatory in Byron Bay, New South Wales), the European Space Agency's Mars Express spacecraft (center) and the Hubble Space Telescope. The images were all taken in mid-May 2016 to mark Mars' arrival at opposition on May 22, 2016. (Image credit: D. O'Donnell - ESA/Mars Express/VMC CC BY-SA 3.0 IGO - ESA/NASA/Hubble)

As Mars reaches its closest approach to Earth in more than a decade tonight (May 30), you can watch the Memorial Day Martian event live online through the Slooh Community Observatory.

The broadcast starts at 9 p.m. EDT (1 a.m. UTC) and can be viewed live on the Slooh website. Viewers can send questions to @Slooh on Twitter, or chat live with the team on The webcast will also be available here on

Mars has always been a source of fascination: The planet is watched over by a fleet of spacecraft; NASA is developing plans to send humans for a visit, and Mars features heavily in pop culture, including the hit movie "The Martian"last year. Its distance from Earth can vary between 33.5 million miles (54 million kilometers) and 249 million miles (400 million km) depending on where the two planets are in their respective orbits. [First Mars, Then Saturn - It's An Opposition Party! (Video)]

Every 26 months, Earth and Mars come to the closest approach in their orbits. During the period between Mars' closest and furthest points, the Red Planet's size changes sevenfold from the perspective of Earthbound observers, Slooh officials said in the statement.

"The size of Mars varies more than any other planet, and we've waited a full decade for it to come this close and appear this large," Slooh astronomer Bob Berman said in a statement. "Throw in the fact that it's the only other planet on which humans will ever walk, and you can understand why everyone will be tuning in to this rare occasion."

The Slooh show will include discussion about Mars science, the planet's cultural significance and also the chances for life on the Martian surface. Berman will co-host the broadcast with fellow Slooh astronomer Paul Cox. The show will also feature Nicole Willett, of the Mars Society, who will talk about the planet's potential for exploration and settlement.

This sky map shows the location of Mars in the southeastern sky at 9 p.m. local time on May 30, 2016, when the planet will be at its closest to Earth in 11 years. Saturn will also be visible nearby, weather permitting. (Image credit: Starry Night Software)

Mars is a point of interest for NASA because of the planet's potential for past or present life. In the past year, scientists have discovered that liquid water currently flows on the Red Planet's surface. The Curiosity rover has been tracking methane levels from the surface, and a newer mission called MAVEN (Mars Atmosphere and Volatile Evolution Mission) is looking at how fast the Martian atmosphere bleeds into space. NASA will land humans on Mars in the 2030s, if current plans come to pass. (Previous human Mars initiatives have been canceled.)

The commercial spaceflight company SpaceX announced in April that it would send a robotic craft to Mars as soon as 2018, with manned flights to follow. A few years ago, a private organization called Mars One announced plans to send a crew of astronauts on a one-way journey to the Red Planet's surface.

That mission is still decades out, but Mars One has selected finalist astronauts and is trying to secure funding and figure out the technology for the construction of the mission base. The company has said it expects robots to complete that construction.

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Elizabeth Howell
Staff Writer, Spaceflight

Elizabeth Howell (she/her), Ph.D., is a staff writer in the spaceflight channel since 2022 covering diversity, education and gaming as well. She was contributing writer for for 10 years before joining full-time. Elizabeth's reporting includes multiple exclusives with the White House and Office of the Vice-President of the United States, an exclusive conversation with aspiring space tourist (and NSYNC bassist) Lance Bass, speaking several times with the International Space Station, witnessing five human spaceflight launches on two continents, flying parabolic, working inside a spacesuit, and participating in a simulated Mars mission. Her latest book, "Why Am I Taller?", is co-written with astronaut Dave Williams. Elizabeth holds a Ph.D. and M.Sc. in Space Studies from the University of North Dakota, a Bachelor of Journalism from Canada's Carleton University and a Bachelor of History from Canada's Athabasca University. Elizabeth is also a post-secondary instructor in communications and science at several institutions since 2015; her experience includes developing and teaching an astronomy course at Canada's Algonquin College (with Indigenous content as well) to more than 1,000 students since 2020. Elizabeth first got interested in space after watching the movie Apollo 13 in 1996, and still wants to be an astronaut someday. Mastodon: