pkrumbein

Mision a Marte-Perseverance Rover

La misión de la NASA a Marte Encuentro difícil traducir la palabra “rover” al español para el vehículo robótico de la NASA Perseverance o Perseverancia que va a ser lanzado a Marte en febrero de 2021 para explorar el cráter Jezero. Estos términos fueron introducidos por sus creadores que le dieron sus nombres en inglés.Continue reading “Mision a Marte-Perseverance Rover”

Trivia 14

El planisferio estelar, or Star and Planet Locator. El planisferio nos da una muy buena oportunidad para disfrutar del cielo nocturno a falta de un telescopio. No es costoso y es facil de llevar. En el video, vais a ver como se usa. Disfruta! http://www.showme.com/sh?h=CeinlGi

Lesson 16

Radio de Hill Objects in the solar disc grow by accretion increasing their gravitational influence over the surrounding material. The Hill radios will define the distance around which the planet, in growing or full grown, will capture any object that is inside this distance. In the video I develop the notes for this distance. TheContinue reading “Lesson 16”

Lecture 15

Las Fuerzas de Marea Las Fuerzas de Marea son fuerzas que se ejercen sobre cuerpos (lunas, por ejemplo, o planetas) que son responsables de la deformación física de estos, debido a la acción de la gravedad. El achatamiento de los planetas es una consecuencia de las fuerzas de marea, como lo es también la fuerzaContinue reading “Lecture 15”

Occultation of Venus- 21 May 2004

Odd Trondal Oslo Norway I found in “Spaceweather” the following video of the occultation of Venus when passing between the Sun and the Earth. Observe the phase of Venus. Tap on the Title.

Lecture 13

Centripetal and Centrifugal Forces Spanish version at the end available As indicated by the expression “centri”, while the ‘centripetal’ is directed towards the center, the ‘centrifugal is directed outwards, in the opposite direction of the center. Already with this definition there is something that does not sound complete. First, this suggests that this is theContinue reading “Lecture 13”

Lecture 14

Calculating “g” In this lecture we will explore the nature of “g”, the acceleration of gravity, from the characteristics of the centrifugal force that a body experiences on a rotating system. Besides of the fact that the attraction of bodies is described and governed by the Universal Gravitational Law, and the weight of a bodyContinue reading “Lecture 14”

Trivia 13

Stars That do not Set Remember you cannot see below your horizon. Consider yourself exactly at the North Pole. You will see all the stars in circular trajectories around Polaris, that you can see as your Zenith is on Polaris. If you are exactly in the Equator, all stars are rising in the East andContinue reading “Trivia 13”

Trivia 12

How do we know the Earth Rotates? Sometimes we think to have a good argument to teach that the Earth rotates by just looking at the sky and watch the stars moving around “us” from East to West, to conclude that the Earth rotates from West to East. That is all right, but it inContinue reading “Trivia 12”

Lecture 12

Harmonic Motion Bodies in a circular path around a center undergo harmonic motion, whit a good approximation applied to the planets around the Sun and moons around planets. In this video we are going to determine the differential equation and give a solution to calculate the resonance gaps in the Asteroid Belt. The lecture isContinue reading “Lecture 12”