APOD 4.2

"of March 3rd" takes you to a collection of pictures of the Lunar Eclipse.
"Eiffel Tower"takes you to the official Eiffel Tower website.
"tourist destination" takes you to the Google Map of the tower.
"Moon is even more" takes you to the Wikipedia entry about the Moon in art and literature.
"visit" takes you to the Wikipedia entry about the Wallace and Gromet movie A Grand Day Out.
"Apollo 17 mission" takes you to the APOD enrty entitled "Apollo 17: VIP Site Anaglyph."

APOD 4.1

"Earth" takes you to an APOD entitled "Ultraviolet Earth from the Moon."

"Saturn" takes you to the Wikipedia entry about Saturn.

"shadow" takes you to an APOD entry entitled "In the Shadow of Saturn."

"this image mosaic" takes you to planetary journal where you can find this image.

"Cassini spacecraft" takes you to a site that explains the spacecraft's journey to Saturn.

"cloud details" takes you to an APOD entitled "The Swirling Storms of Saturn."

"terminator" takes you to an APOD entitled "Earth at Twilight."

APOD 3.9

"images of M16" takes you to a satellite site with information about this nebula.
"x-ray sources" takes you to the same website as above but with information about x-ray astronomy vs. medical rays.
"Pillars of Creation" takes you to an APOD entitled "M16: Pillars of Creation."
"near" takes you to the same satellite website but with pictures.
"as the Sun" takes you to a website to learn about the mass of the Sun.
"indication" takes you to a website with information about astrophysics and observations in this nebula.
"within" takes you to the same website from above with information about star formation.
"Eagle Nebula" take you to a website on this nebula.

APOD 3.8

"images" takes you to Planetary Journal where you can find the picture.
"Mars Reconnaissance Orbiter" takes you to Wikipedia to learn about the MRC.
"current leading hypothesis" takes you to JPL to read a news update about Mars.
"bleached" takes you to Wikipedia to learn about bleach.
"Earth" takes you to an APOD entitled "Welcome to Planet Earth."
"microbial life" takes you to microbworld to learn about microbes.
"Candor Chasma" takes you to an APOD entitled "Candor and Ophir Chasmata."
"Valles Marineris" takes you to an APOD entitled "Valles Marineris: The Grand Canyon of Mars."
"Mars" takes you to a website on Mars.