The discovery, along with his discovery of three other large moons around Jupiter, was the first time a moon was discovered orbiting a planet other than Earth. Ganymede was discovered by Italian astronomer Galileo Galilei on Jan. NASA’s Juno spacecraft took the most recent images of Ganymede’s surface during flybys in June 2021. This suggests to scientists that Ganymede's crust has been under tension from global tectonic processes. Ganymede has two distinct types of terrain: large, bright regions of ridges, and grooves that slice across older, darker terrains. Credit: NASA/JPL-Caltech/SwRI | Full image and caption Mirror – n.This image of the dark side of Ganymede was obtained by Juno’s Stellar Reference Unit navigation camera during its June 7, 2021, flyby of the moon. a device that can tell if a substance or object is present used to describe rays of light that cannot be seen and that are slightly shorter than the rays of violet lightĭetector – n. producing or using rays of light that cannot be seen and that are longer than rays that produce red light any of the very large groups of stars and associated matter that are found throughout the universe to turn or cause someone or something to turn around repeatedly a person who is a specialist in astronomyĪwe-inspiring – adj. the scientific study of stars, planets, and other objects in outer space : astronomer – n. of or occurring in the tropicsĪstronomy – n. The AP is solely responsible for all content. The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The European Space Agency is paying for the launch costs. That includes the first five years of operation. Webb’s price tag is an estimated $10 billion. That does not include all the shuttle flights for launch and repairs. NASA’s cost for Hubble from its 1970s development until now is about $16 billion, adjusted for inflation. The Hubble and Webb do have things in common: Production of both were years late and overbudget. However, Webb’s mirror is lighter because it is made of beryllium, a strong but lightweight metal. To see the universe’s first stars, Webb needs the largest mirror ever launched for astronomy. Between each of the sunshield’s five layers is a hole so heat can escape out the sides. To stay this cold, Webb carries an “umbrella” the size of a tennis court. Webb’s detectors need to run at minus 240 degrees Celsius. So, Webb will see them in their infrared form, which is stretched out and giving off heat. The shorter visible and ultraviolet light given off by the first stars and galaxies have been stretched as the universe grows. Webb has infrared vision, so it can see light that is invisible to the Hubble. This will come ever closer in time to the Big Bang, the moment the universe formed 13.8 billion years ago. Astronomers want to close that 300 million year hole with Webb. Hubble has looked back as far as 13.4 billion years. This light will show us how the original stars looked 13.7 billion years ago. Webb is expected to record light from the universe’s first stars and galaxies. If it runs into problems, it will be on its own. Webb is heading to a much more distant spot - 1.6 million kilometers away. However, this will not be the case with Webb. When problems happened on Hubble, ground control specialists and astronauts were able to fix them. That distance was determined by the abilities of NASA’s space shuttles. For Webb, the NASA website explains that it was helpful for the launch to be near the equator because “…the spin of the Earth can help give an additional push.” In 1990, the Hubble caught a ride to its orbit inside NASA’s space shuttle Discovery. The Webb telescope is bigger and 100 times more powerful than Hubble. “Hubble will always be loved for its awe-inspiring images of our universe and will continue to collect important data for astronomers.” But the Webb telescope, Mullally adds, will permit us to see places in the universe never before seen. She is Webb’s assistant project scientist at the Space Telescope Science Institute in Baltimore, Maryland in the United States. “Comparing Hubble and Webb is like asking if you love your second child as much as your first,” said Susan Mullally. But when talking with scientists of astronomy, do not ask them to pick a favorite. Webb is widely seen as the next generation telescope.Įxperts recently spoke with The Associated Press about the differences between the two telescopes. NASA and the European Space Agency’s Hubble telescope has been circling the Earth for nearly 32 years. “ Lift off! From a tropical rainforest to the edge of time itself, James Webb begins a voyage back to the birth of the universe.” On December 25, the new James Webb Space Telescope launched into space from South America on a European Ariane 5 rocket.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |