Help Shape the Future of Space Exploration

Join The Planetary Society Now  arrow.png

Join our eNewsletter for updates & action alerts

    Please leave this field empty
Blogs

Headshot of Emily Lakdawalla

Mercury: a moon-scale body

Posted by Emily Lakdawalla

17-03-2011 18:15 CDT

Topics: Jupiter's moons, Io, Europa, scale comparisons, Mercury, Titan, Ganymede, Callisto, Triton, the Moon, Neptune's moons, Saturn's moons

As I wait for the MESSENGER Mercury Orbit Insertion webcast to start, I thought I'd fiddle with some images to point out that Mercury is a bridge between the scales of planets and the scales of moons. Here's a collage of the eight bodies in the solar system that are between 2,500 and 6,000 kilometers in diameter. That's Mercury on the left, then the Moon, then the four Galilean moons of Jupiter, then Titan, then Triton. Both Ganymede and Titan are bigger than Mercury; Ganymede's actually the biggest but Titan appears bigger because of its puffy atmosphere.

Some similar-sized objects in the solar system

All images NASA / JPL / Ted Stryk except the Moon (Alfredo Balreira) and Titan (NASA / JPL / SSI / Emily Lakdawalla). Montage by Emily Lakdawalla.

Some similar-sized objects in the solar system
These are the eight bodies in the solar system that are between 2,500 and 5,300 kilometers in diameter: Mercury (4,879 kilometers), the Moon (3,475), Io (3,639), Europa (3,125), Ganymede (5,265), Callisto (4,819), Titan (5,150, but it appears 5,550 with its atmosphere), and Triton (2,706). The next biggest body is much larger Mars, at 6,794 kilometers, and much smaller Titania, at 1,578.
 
See other posts from March 2011

 

Or read more blog entries about: Jupiter's moons, Io, Europa, scale comparisons, Mercury, Titan, Ganymede, Callisto, Triton, the Moon, Neptune's moons, Saturn's moons

Comments:

Leave a Comment:

You must be logged in to submit a comment. Log in now.
Facebook Twitter Email RSS AddThis

Blog Search

Planetary Defense

An asteroid or comet headed for Earth is the only large-scale natural disaster we can prevent. Working together to fund our Shoemaker NEO Grants for astronomers, we can help save the world.

Donate

Featured Images

LightSail 2 and Prox-1
Bill Nye at LightSail 2 pre-ship review
LightSail 2 pre-ship review team photo
Swirling maelstrom
More Images

Featured Video

Class 9: Saturn, Uranus, and Neptune

Watch Now

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Join The Planetary Society

Let’s explore the cosmos together!

Become a Member

Connect With Us

Facebook, Twitter, YouTube and more…
Continue the conversation with our online community!