Incommensurate
发表于 2025-3-25 03:31:30
School, Home, Camp: Differences in Approach a child is a teacher and should benefit from what this book offers. This chapter consider these special hours under the sky, whether they are held outside a classroom, at a summer camp, or in your own backyard.
cancellous-bone
发表于 2025-3-25 09:04:38
Safe Sunhe sky by day. The Sun is a fascinating place, busy and churning. It would be the ideal astronomical object for children, if it were not for the fact that a single look through an unprotected eyepiece will blind a child forever.
符合国情
发表于 2025-3-25 14:09:17
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讨好女人
发表于 2025-3-25 16:17:22
A Week to Remember: Comet Shoemaker—Levy 9 and Jupiterbject in the sky. The planet Jupiter was about to be bombarded by a string of 21 comets. For the first time in history, we would see the solar system in action as a comet its life in the dense atmosphere of mighty Jupiter. We tell the story of the comet crashes in this book to give parents, teachers
Tartar
发表于 2025-3-25 22:36:21
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起皱纹
发表于 2025-3-26 02:58:15
Advanced Project: Variable Starsan organization called the American Association of Variable Star Observers (AAVSO), in existence for more than 80 years, that has as its sole purpose these collection of observations of these variable stars by amateur astronomers.
GUMP
发表于 2025-3-26 05:54:59
Galaxies and the Universef the stars. Now we resume our outward journey. Imagine traveling beyond the stars, the nebulae, remnants or ancient surpernovae, and the outskirts of our own galaxy to the void that lies beyond. Here is the realm of the galaxies, where the sky is marked not by the pinpoints of light we call stars b
mitral-valve
发表于 2025-3-26 11:27:28
Keeping an Observing Logl world around him and keeping a journal in which he recorded what he saw. Thoreau thought deeply about his experiences. “Both place and time were changed,” he wrote of one of his first nights under the stars, “and I dwelt nearer to those parts of the universe and to those eras of history which had most attracted me.”
小步舞
发表于 2025-3-26 13:20:09
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Melanoma
发表于 2025-3-26 17:32:35
Galaxies and the Universe our own galaxy to the void that lies beyond. Here is the realm of the galaxies, where the sky is marked not by the pinpoints of light we call stars but by giant islands in the sea of space, each a cauldron of billions of stars, each called a galaxy.