HOMEWORK HELPER
I need help with a report about...


The Swiftest Planet
Sun-scorched Mercury is only slightly larger than Earth's moon. Like the moon, Mercury has very little atmosphere to stop impacts, and it is covered with craters. Mercury's dayside is super-heated by the sun, but at night temperatures drop hundreds of degrees below freezing. Ice may even exist in craters. Mercury's egg-shaped orbit takes it around the sun every 88 days.

Mercury Icon
Just the Facts
Just the Facts
Dig Deeper
Dig Deeper
Dig Deeper
Create Your Report
Create Your Report
Even More Stuff...
Even More Stuff...
  News Features People Extreme Facts Dictionary

Planetary Seasons
Planetary Seasons
Planetary seasons are caused by two factors: axial tilt and variable distance from the sun (orbital eccentricity).Read More...
Planets Aligning in the Sunset Sky
Planets Aligning in the Sunset Sky
The sunset of May 26th will be extra special. On that date, Venus, Jupiter and Mercury will gather in the fading twilight to form a bright triangle only three degrees wide.Read More...
Solar System Exploration @ 50: What the Experts Picked
Research... at a Glance
Solar System Exploration @ 50: What the Experts Picked
Here is what the experts had to say about their favorite moments last 50 years of planetary robotic exploration.Read More...
State of the Solar System
State of the Solar System
As the president prepares to give his annual State of the Union Address, we offer our own update from the ongoing exploration of our cosmic neighborhood.Read More...
Earth at Perihelion
Earth at Perihelion
In January, our planet made its annual closest approach to the sun. But don't expect things to warm up.Read More...
MESSENGER Finds New Evidence for Water Ice at Mercury's Poles
MESSENGER Finds New Evidence for Water Ice at Mercury's Poles
New observations by the MESSENGER spacecraft provide compelling support for the long-held hypothesis that Mercury harbors abundant water ice and other frozen volatile materials in its permanently shadowed polar craters.Read More...
Strange Hollows Discovered on Mercury
Strange Hollows Discovered on Mercury
NASA's MESSENGER spacecraft has discovered strange hollows on the surface of Mercury.Read More...
Orbital Observations of Mercury Reveal Flood Lavas, Hollows, and Unprecedented Surface Details
Orbital Observations of Mercury Reveal Flood Lavas, Hollows, and Unprecedented Surface Details
After only six months in orbit around Mercury, NASA's MESSENGER spacecraft is sending back information that has revolutionized the way scientists think about the innermost planet.Read More...
Planetary Seasons
Planetary Seasons
Planetary seasons are caused by two factors: axial tilt and variable distance from the sun (orbital eccentricity).Read More...
Planets Aligning in the Sunset Sky
Planets Aligning in the Sunset Sky
The sunset of May 26th will be extra special. On that date, Venus, Jupiter and Mercury will gather in the fading twilight to form a bright triangle only three degrees wide.Read More...
Solar System Exploration @ 50: What the Experts Picked
Research... at a Glance
Solar System Exploration @ 50: What the Experts Picked
Here is what the experts had to say about their favorite moments last 50 years of planetary robotic exploration.Read More...
State of the Solar System
State of the Solar System
As the president prepares to give his annual State of the Union Address, we offer our own update from the ongoing exploration of our cosmic neighborhood.Read More...
Earth at Perihelion
Earth at Perihelion
In January, our planet made its annual closest approach to the sun. But don't expect things to warm up.Read More...
MESSENGER Finds New Evidence for Water Ice at Mercury's Poles
MESSENGER Finds New Evidence for Water Ice at Mercury's Poles
New observations by the MESSENGER spacecraft provide compelling support for the long-held hypothesis that Mercury harbors abundant water ice and other frozen volatile materials in its permanently shadowed polar craters.Read More...
Strange Hollows Discovered on Mercury
Strange Hollows Discovered on Mercury
NASA's MESSENGER spacecraft has discovered strange hollows on the surface of Mercury.Read More...
Orbital Observations of Mercury Reveal Flood Lavas, Hollows, and Unprecedented Surface Details
Orbital Observations of Mercury Reveal Flood Lavas, Hollows, and Unprecedented Surface Details
After only six months in orbit around Mercury, NASA's MESSENGER spacecraft is sending back information that has revolutionized the way scientists think about the innermost planet.Read More...