How many Ceres can fit in Earth

Overview

Dwarf planet Ceres is the largest object in the asteroid belt between Mars and Jupiter, and it's the only dwarf planet located in the inner solar system. It was the first member of the asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801. And when NASA's Dawn arrived in 2015, Ceres became the first dwarf planet to receive a visit from a spacecraft.

Called an asteroid for many years, Ceres is so much bigger and so different from its rocky neighbors that scientists classified it as a dwarf planet in 2006. Even though Ceres comprises 25% of the asteroid belt's total mass, Pluto is still 14 times more massive.

Ceres is named for the Roman goddess of corn and harvests. The word cereal comes from the same name.

Go farther: Explore Ceres ›

Ten Things to Know About Ceres

10 Need-to-Know Things About Ceres

1

Small World

Ceres’ radius is just 296 miles (476 km). If Earth were the size of a nickel, Ceres would be about as big as a poppy seed.

2

Orbits the Sun

Ceres takes 1,682 Earth days, or 4.6 Earth years, to make one trip around the Sun.

3

Seize the Day

Ceres completes one rotation around its axis every 9 hours.

4

No Longer an Asteroid

Ceres is so much bigger and so different from its neighbors that scientists classified it as a dwarf planet in 2006.

5

Atmosphere

There’s no evidence of an atmosphere on Ceres, only sporadic water vapor—possibly from ice ejected by small impacts.

6

Moonless

Ceres does not have any moons.

7

Ringless

Ceres does not have any rings.

8

First Dwarf Planet Visited by Spacecraft

Dawn reached it in 2015 to study its surface, composition and history.

9

Potential For Life?

Scientists would like to search for possible signs of life on Ceres. It has something many other planets don't: water.

10

Food For Thought

Ceres is named for the Roman goddess of grain crops and harvests. The word cereal comes from the same name.

Occator and Ahuna

Pop Culture

Pop Culture

The largest body in the asteroid belt, Ceres has amassed a number of references in science fiction stories of the 20th and 21st centuries. In the TV series "The Expanse," Ceres is inhabited by humans, and in the PC Game Descent, one of the secret levels takes place on Ceres.

In the video game Destiny, Ceres was colonized by an alien race called the Fallen at the end of humanity's Golden Age. Ceres was later destroyed by a civilization of post-humans who inhabit the asteroid belt.

Read More

Read More

Dawn Mission Homepage

NASA Planetary Photojournal - Ceres

Introduction

Dwarf planet Ceres is the largest object in the asteroid belt between Mars and Jupiter, and it's the only dwarf planet located in the inner solar system. It was the first member of the asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801. When NASA's Dawn arrived in 2015, Ceres became the first dwarf planet to receive a visit from a spacecraft.

Called an asteroid for many years, Ceres is so much bigger and so different from its rocky neighbors that scientists classified it as a dwarf planet in 2006. Even though Ceres comprises 25% of the asteroid belt's total mass, Pluto is still 14 times more massive.

Namesake

Namesake

Ceres is named for the Roman goddess of corn and harvests. The word cereal comes from the same name.

Potential for Life

Potential for Life

Ceres is one of the few places in our solar system where scientists would like to search for possible signs of life. Ceres has something a lot of other planets don't: water. Here on Earth, water is essential for life, so it's possible that with this ingredient and a few other conditions met, life possibly could exist there. If anything does live on Ceres, it's likely to be very small microbes similar to bacteria. If Ceres does not have living things today, there may be signs it harbored life in the past.

Size and Distance

Size and Distance

With a radius of 296 miles (476 kilometers), Ceres is 1/13 the radius of Earth. If Earth were the size of a nickel, Ceres would be about as big as a poppy seed.

From an average distance of 257 million miles (413 million kilometers), Ceres is 2.8 astronomical units away from the Sun. One astronomical unit (abbreviated as AU), is the distance from the Sun to Earth. From this distance, it takes sunlight 22 minutes to travel from the Sun to Ceres.

A 3D model of Ceres, a dwarf planet in the main asteroid belt between Mars and Jupiter. Credit: NASA Visualization Technology Applications and Development (VTAD) › Download Options

Orbit and Rotation

Orbit and Rotation

Ceres takes 1,682 Earth days, or 4.6 Earth years, to make one trip around the Sun. As Ceres orbits the Sun, it completes one rotation every 9 hours, making its day length one of the shortest in the solar system.

Ceres' axis of rotation is tilted just 4 degrees with respect to the plane of its orbit around the Sun. That means it spins nearly perfectly upright and doesn't experience seasons like other more tilted planets do.

Moons

Moons

Ceres does not have any moons.

Rings

Rings

Ceres does not have any rings.

Formation

Formation

Ceres formed along with the rest of the solar system about 4.5 billion years ago when gravity pulled swirling gas and dust in to become a small dwarf planet. Scientists describe Ceres as an "embryonic planet," which means it started to form but didn't quite finish. Nearby Jupiter's strong gravity prevented it from becoming a fully formed planet. About 4 billion years ago, Ceres settled into its current location among the leftover pieces of planetary formation in the asteroid belt between Mars and Jupiter.

Structure

Structure

Ceres is more similar to the terrestrial planets (Mercury, Venus, Earth, and Mars) than its asteroid neighbors, but it is much less dense. One of the similarities is a layered interior, but Ceres' layers aren’t as clearly defined. Ceres probably has a solid core and a mantle made of water ice. In fact, Ceres could be composed of as much as 25 percent water. If that is correct, Ceres has more water than Earth does. Ceres' crust is rocky and dusty with large salt deposits. The salts on Ceres aren’t like table salt (sodium chloride), but instead are made of different minerals like magnesium sulfate.

Surface

Surface

Ceres is covered in countless small, young craters, but none are larger than 175 miles (280 kilometers) in diameter. This is surprising, given that the dwarf planet must have been hit by numerous large asteroids during its 4.5 billion-year lifetime.

The lack of craters might be due to layers of ice just below the surface. The surface features could smooth out over time if ice or another lower-density material, such as salt, is just below the surface. It's also possible that past hydrothermal activity, such as ice volcanoes, erased some large craters.

Within some of Ceres' craters, there are regions that are always in shadow. It's possible that without direct sunlight, these "cold traps" could have water ice in them for long periods of time.

Atmosphere

Atmosphere

Ceres has a very thin atmosphere, and there is evidence it contains water vapor. The vapor may be produced by ice volcanoes or by ice near the surface sublimating (transforming from solid to gas).

Magnetosphere

Magnetosphere

Scientists don't think Ceres has a magnetosphere.

Resources

Resources

  • NASA News Portal: Dawn mission to Ceres and Vesta
  • Ceres: NASA Photojournal Ceres collection
  • Ceres Trek: Ceres data science visualization tool

What is the size of Ceres compared to Earth?

With a radius of 296 miles (476 kilometers), Ceres is 1/13 the radius of Earth. If Earth were the size of a nickel, Ceres would be about as big as a poppy seed. From an average distance of 257 million miles (413 million kilometers), Ceres is 2.8 astronomical units away from the Sun.

What asteroid is bigger than Ceres?

Largest by diameter.

What is Ceres bigger than?

Ceres taken by the same spacecraft. Ceres is much smaller than the Moon, which is shown below on the same scale as Ceres and Vesta above. Nonetheless, Ceres is sometimes referred to as a dwarf planet, along with Pluto and a growing list of other objects. Moon image from NASA's Galileo spacecraft.

Is Ceres bigger than Jupiter?

Dwarf planet Ceres is the largest object in the asteroid belt between Mars and Jupiter, and it's the only dwarf planet located in the inner solar system. It was the first member of the asteroid belt to be discovered when Giuseppe Piazzi spotted it in 1801.