181 Things To Do On The Moon
If you woke up tomorrow morning and found yourself on the moon, what would you do? NASA has just released a list of 181 good ideas.
http://science.nasa.gov/headlines/y2007/02feb_181.htm

Active Galaxies and Quasars
Active galaxies are galaxies which have a small core of emission embedded in an otherwise typical galaxy. This core may be highly variable and very bright compared to the rest of the galaxy...
http://imagine.gsfc.nasa.gov/docs/science/know_l1/active_...

An Icy Discovery on Mars, but Where?s the Water?
After a much ballyhooed discovery two months ago of water ice in the northern plains of Mars, scientists are now perplexed by the water that NASA?s Phoenix Mars lander has not found.
http://www.nytimes.com/2008/09/09/science/09mars.html?ref...

Asteroid and Comet Impact Hazards
The Earth orbits the Sun in a sort of cosmic shooting gallery, subject to impacts from comets and asteroids. It is only fairly recently that we have come to appreciate that these impacts by asteroids and comets (often called Near Earth Objects, or NEOs)..
http://impact.arc.nasa.gov/

Astronomy Picture of the Day
Every Day a New Photo!!
http://antwrp.gsfc.nasa.gov/apod/astropix.html

Atlas of the Universe
There are nine main maps on this web page, each one approximately ten times the scale of the previous one. The first map shows the nearest stars and then the other maps slowly expand out until we have reached the scale of the entire visible universe.
http://www.anzwers.org/free/universe/index.html

Black Holes
Black holes are the evolutionary endpoints of stars at least 10 to 15 times as massive as the Sun. If a star that massive or larger undergoes a supernova explosion, it may leave behind a fairly massive burned out stellar remnant...
http://imagine.gsfc.nasa.gov/docs/science/know_l2/black_h...

Comet Halley
The average period of Halley's orbit is 76 years....The gravitational pull of the major planets alters the orbital period from revolution to revolution
http://www.nineplanets.org/halley.html

Comets, Meteors and Asteroids
Comets, asteroids, and meteors are often grouped together since they are all basically the same thing: small pieces of rock and/or ice that aren't part of a major planet.
http://curious.astro.cornell.edu/comets.php

DISCOVERY MISSION: MESSENGER
The MESSENGER (MErcury Surface, Space ENvironment, GEochemistry, and Ranging) mission is a scientific investigation of the planet Mercury
http://discovery.nasa.gov/messenger.html