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

Blog Archive


The round worlds in the solar system: An updated graphic

Posted by Emily Lakdawalla on 2015/11/02 04:06 CST | 9 comments

I have a newly updated scale comparison graphic to share: all the round worlds in the solar system smaller than 10,000 kilometers in diameter, now with added Pluto, Charon, and Ceres.

Read More »

The solar system at 1 kilometer per pixel: Can you identify these worlds? The answers

Posted by Emily Lakdawalla on 2015/09/30 10:00 CDT | 13 comments

Last Friday I posted an image containing 18 samples of terrain, all shown at the same scale. Were you able to figure out which square was which? Here are the answers.

Read More »

The solar system at 1 kilometer per pixel: Can you identify these worlds?

Posted by Emily Lakdawalla on 2015/09/25 02:27 CDT | 13 comments

A look at the surfaces of 18 worlds in our solar system, all at the same scale.

Read More »

Galileo's best pictures of Jupiter's ringmoons

Posted by Emily Lakdawalla on 2015/08/24 07:07 CDT | 4 comments

People often ask me to produce one of my scale-comparison montages featuring the small moons of the outer solar system. I'd love to do that, but Galileo's best images of Jupiter's ringmoons lack detail compared to Cassini's images from Saturn.

Read More »

The not-planets

Posted by Emily Lakdawalla on 2015/07/14 12:48 CDT | 37 comments

Now that I have a reasonable-resolution global color view of Pluto, I can drop it into one of my trademark scale image montages, to show you how it fits in with the rest of the similar-sized worlds in the solar system: the major moons and the biggest asteroids.

Read More »

Adding Churyumov-Gerasimenko to my scale comparison of comets and asteroids

Posted by Emily Lakdawalla on 2015/03/13 05:47 CDT | 4 comments

Having found a color photo of the comet, I finally added Churyumov-Gerasimenko to my scale comparison of comets and asteroids visited by spacecraft.

Read More »

New Rosetta view of the comet - and a comparison to other comets

Posted by Emily Lakdawalla on 2014/07/31 03:02 CDT | 8 comments

Rosetta's view of the comet is getting better and better. Today they released a new image from the high-resolution OSIRIS camera, and it's a very fresh one, taken only two days ago. Distinct features are coming into view. And it's finally detailed enough for me to compare it to the five other comets we've visited in the past.

Read More »

A close look at Saturn's closest moons

Posted by Emily Lakdawalla on 2014/06/26 08:13 CDT | 1 comments

A new composite image of the eight named moons that orbit closest to Saturn, and a list of all the best Cassini observations of these moons.

Read More »

Intro Astronomy Class 6: Mars (continued) and Asteroids

Posted by Bruce Betts on 2014/03/14 06:10 CDT

Continue exploring Mars and learn about asteroids in this video of class 6 of Bruce Betts' Introduction to Planetary Science and Astronomy class.

Read More »

2015 will be the Year of the Dwarf Planet, and you need to tell people about it!

Posted by Emily Lakdawalla on 2014/03/05 07:00 CST | 11 comments

I am very excited about 2015, more so than I have been about any year since I started working at The Planetary Society. Dawn will enter orbit at Ceres, and New Horizons, which will fly past Pluto and Charon. But if we want this kind of exploration to continue, I'm challenging you, dear readers, to tell the world why such non-planetary worlds are compelling places to go exploring.

Read More »

New names for Pluto's little moons Kerberos and Styx; and a new moon for Neptune

Posted by Emily Lakdawalla on 2013/07/15 01:37 CDT | 5 comments

Pluto's moons, formerly known as "P4" and "P5," are now named Kerberos and Styx; I thought I'd help place them into context with a little help from Cassini. Also, Neptune now has a 14th known moon.

Read More »

Scale comparisons of the solar system's major moons

Posted by Emily Lakdawalla on 2013/07/10 06:05 CDT | 15 comments

A few presentation slides with pretty pictures, sized to scale, of the large moons of the solar system.

Read More »

My ever-popular asteroids-and-comets montage, now in color, with bonus Toutatis

Posted by Emily Lakdawalla on 2012/12/18 04:26 CST | 9 comments

My collage of all the asteroids and comets visited by spacecraft is probably the single most popular image I have ever posted on this blog. I've now updated it to be in color and to include Toutatis.

Read More »

Cheat sheets for Vesta's craters and Dawn's Vesta timeline

Posted by Emily Lakdawalla on 2012/04/19 01:38 CDT

I made myself a cheat sheet to many of Vesta's distinctive-looking craters, and also wrote down a list of the major dates in the timeline of Dawn's exploration of Vesta.

Read More »

This is how far human radio broadcasts have reached into the galaxy

Posted by Emily Lakdawalla on 2012/02/24 05:26 CST | 2 comments

There is an ever-expanding bubble announcing Humanity's presence to anyone listening in the Milky Way.

Read More »

The Scale of the Universe, by Cary and Michael Huang

Posted by Emily Lakdawalla on 2012/02/16 10:14 CST

Cary and Michael Huang present a basic "powers of ten" visualization starting at human scale from which you can scrub downward smaller than quarks or upward to the scale of the entire universe.

Read More »

Where are the big Kuiper belt objects?

Posted by Emily Lakdawalla on 2012/02/16 05:35 CST | 8 comments

Earlier today I wrote a post about how to calculate the position of a body in space from its orbital elements. I'm trying to get a big-picture view of what's going on in trans-Neptunian space.

Read More »

The Arecibo Trip

Posted by Bill Nye on 2012/02/03 01:09 CST | 1 comments

I have just returned from my first Planetary Society-sponsored trip to Puerto Rico and this historic, remarkable, big idea of a telescope.

Read More »

At last, I've finished my scale solar system presentation slide/poster

Posted by Emily Lakdawalla on 2011/12/01 01:22 CST

A presentation providing a correctly scaled, reasonably correctly colored view of the largest bodies in the solar system is made available for use by teachers, professors, and informal educators.

Read More »

Scale solar system presentation slide, version 2

Posted by Emily Lakdawalla on 2011/10/31 01:14 CDT

Last month I posted a preliminary version of a slide I was working on for use in my public presentations, a slide that contains everything in the solar system bigger than 400 kilometers across, and invited comment. I've listened to all of your comments and corrections and come up with a second version.

Read More »

Items 1 - 20 of 23  12Next
Facebook Twitter Email RSS AddThis


Advocate for Space!

Fifteen years ago, Society members and passionate space advocates like you helped save the Pluto mission. Now we can do the same for missions to Europa and Mars.

Join over 27,600 people who have completed their petition and consider a donation to support advocacy efforts.

Sign Our Petition

Featured Images

LightSail-B on the bench
Blue Origin New Shepard after first landing
New Shepard test flight and booster landing
Suni Williams and Doug Hurley in Crew Dragon
More Images

Featured Video

MISSIONS: Dawn In The Asteroid Belt With Marc Rayman

Watch Now

Space in Images

Pretty pictures and
awe-inspiring science.

See More

Selfies to Space!

Take flight with a selfie on LightSail™ in 2016!

Send a Selfie Now

Connect With Us

Facebook! Twitter! Google+ and more…
Continue the conversation with our online community!