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Space Science Digital > Blog > Astronomy > What’s Earth’s most distant spacecraft?
Astronomy

What’s Earth’s most distant spacecraft?

By Aimee Daly April 4, 2023 6 Min Read
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What’s Earth’s most distant spacecraft?Voyagers’ beginningsThe most distant spacecraft keeps on goingEditors of EarthSkyAbout the Author:
On February 14, 1990, the Voyager 1 spacecraft – most distant spacecraft from Earth – pointed its cameras back toward the sun and captured a series of images of our sun and its planets. It was the first-ever “portrait” of our solar system, as seen from the outside. At that time, Voyager 1 was approximately 4 billion miles (6 billion km) away. Read more about this image.

What’s Earth’s most distant spacecraft?

The most distant artificial object is the spacecraft Voyager 1, which – in April 2023 – is more than 14 billion miles (23 billion km) from Earth. Voyager 1 and its twin, Voyager 2, were launched 16 days apart in 1977. Both spacecraft flew by Jupiter and Saturn. Voyager 2 also flew by Uranus and Neptune. Now both Voyagers are journeying into the space between the stars. Voyager 1 officially became the first earthly craft to leave the solar system, crossing the heliopause in 2012. In 2021, it sent back a message that it’s hearing a faint, monotone hum of interstellar space.

Curiously, for a few months every year, the Voyager spacecraft actually get closer to Earth. That’s because in Earth’s orbit around the sun, we move away from the spacecraft (as they move away from us). And then we move back toward them as we swing around the sun, so the distance between us and the Voyagers gets smaller temporarily. You can read more about it here: Why are the Voyager spacecraft getting closer to Earth?

Last chance to get a moon phase calendar! Only a few left. On sale now.

Voyagers’ beginnings

Both Voyager spacecraft were designed back in the early 1970s. They were built to take advantage of a rare grouping of planets on a single side of the sun in our solar system. This grouping, which happens only every 176 years, let the Voyagers slingshot from one planet to the next, via gravitational assists.

The Voyagers began acquiring images of Jupiter in January 1979. Voyager 1 completed its Jupiter encounter in early April of that year. Voyager 2 picked up the baton in late April and its encounter continued into August. The two spacecraft took more than 33,000 pictures of Jupiter and its five major satellites.

And then the Voyagers went farther. When they were launched, no spacecraft had gone as far as Saturn, which is 10 times as far as Earth’s distance from the sun. The four-year journey to Saturn was thus a major leap, with the Voyagers arriving at Saturn nine months apart, in November 1980 and August 1981. Voyager 1 then began leaving the solar system, and Voyager 2 went on to an encounter with Uranus in January 1986 and with Neptune in August 1989.

The most distant spacecraft keeps on going

Ed Stone – who was Project Scientist for the Voyager mission – told EarthSky some years ago:

We built the spacecraft with enough redundancy – that is, backup systems – so that they could keep going.

And keep going they did! The Voyagers have now been traveling for 46 years.

Diagram of sky with a spiraling line - the path of Voyager 1 - superimposed on the constellations.
View larger. | Voyager 1’s trajectory in Earth’s sky from 1977-2030. Image via Tomruen/ Wikimedia Commons/ CC BY-SA 4.0.

In 2017, astronomers described using the Hubble Space Telescope to look along the Voyagers’ paths. In about 40,000 years, long after both spacecraft are no longer operational, Voyager 1 will pass within 1.6 light-years of the star Gliese 445, in the constellation Camelopardalis. Meanwhile, Voyager 2 will pass 1.7 light-years from the star Ross 248 in the constellation Andromeda in about 40,000 years.

Read more: Hubble peers along Voyagers’ future paths

Diagram: planets, Kuiper belt, heliopause, and positions of 2 Voyagers in beams coming from Hubble.
View larger. | Artist’s concept of the paths of the Voyager 1 and 2 spacecraft on their journey through our solar system and out into interstellar space. Image via NASA/ ESA/ and Z. Levay (STScI). Read more about this image.

Bottom line: Voyager 1 and its twin, Voyager 2, launched 16 days apart in 1977. Voyager 1 is now the most distant spacecraft from Earth.

Mission status: Where are the Voyagers?

Read more: New Horizons spacecraft takes image looking toward Voyager 1

Editors of EarthSky

View Articles

About the Author:

The EarthSky team has a blast bringing you daily updates on your cosmos and world. We love your photos and welcome your news tips. Earth, Space, Sun, Human, Tonight. Since 1994.

TAGGED: distant, Earths, most distant spacecraft voyager 1 2018, space, spacecraft, Spaceflight, Whats

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Aimee Daly April 4, 2023
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