The What and Why of JWST

The What and Why of JWST
James Webb Space Telescope with its gold-plated mirrors

If all goes as planned, Christmas Eve will see the launch of the James Webb Space Telescope (JWST or WEBB). It has been a long time in the making with many delays and cost overruns, but it seems that the time has finally arrived. The JWST was supposed to launch in 2007 at the cost of $1 billion. Now it is launching at the end of 2021, and the price has escalated to $10 billion. Let’s examine the what and why of JWST.

First, the what of JWST. The James Webb Space Telescope is a successor to the Hubble Space Telescope (HST or Hubble). It is intended to be a space observatory with capabilities far beyond HST, which was launched in 1990. NASA designed the JWST, and Northrop Grumman built it in California. The European Space Agency will launch it from their launch site in French Guiana, South America.

The why of JWST is that scientists expect it to revolutionize astronomy and expand our knowledge of the universe. Science and technology have made great strides since Hubble was launched and even since astronauts repaired and updated it, most recently in 2009. JWST will observe the universe in infrared light, while HST is limited to visible light. Because galaxies farther away are retreating at increasing speeds, their light shifts toward the red or infrared spectrum. Scientists hope that JWST can observe farther back toward the cosmic creation event known as the big bang. Because of that, astronomers expect to learn more about the formation of stars and galaxies.

Earth-based telescopes must always observe the universe through our atmosphere with particles, pollution, and moisture. That limits their ability to obtain sharp, precise images. Space-based telescopes, like Hubble, eliminate that problem. Webb will give much sharper images with its mirror made of beryllium coated with gold and a diameter more than 2.5 times as wide as Hubble’s.

JWST will locate itself at the Lagrange point where the gravity of Earth and Sun balance each other. That is 930,000 miles (1.5 million km) from Earth. Repairs or upgrades such as those performed on Hubble will not be possible at that distance. That means everything will have to perform flawlessly when the telescope reaches its destination. Deploying the mirror, sun-shield, super-cooling equipment, and telemetry equipment will take a month, which NASA has called “29 days on the edge.”

Another thing that astronomers hope to study with JWST is dark matter, the stuff that’s out there but cannot be seen or detected by any means science has discovered. The way they know dark matter must be there is that it holds the galaxies together. Physics cannot explain why spinning, spiral galaxies, such as the Milky Way, do not fly apart because of centrifugal force. Astronomers hope that JWST’s high-definition images can at least show us where the dark matter is by what they call “gravitational lensing.”

So that is the what and why of JWST. We are excited to see the new images of the universe the James Webb Space Telescope will capture. As we learn about the formation of stars and galaxies, it opens the door to knowledge of God’s handiwork, allowing us to say, “So that’s how God did it!

— Roland Earnst © 2021

Reference: You can find much more about the James Webb Space Telescope at NASA’s fact sheet at THIS LINK.

Unique and Bizarre Planet Earth

Unique and Bizarre Planet Earth

“Planet Earth – Unique And Bizarre.” Those are the words used by Astronomy magazine (June 2021, page 21) to describe the results of studies of the planets within and beyond our solar system. Why is Earth a unique and bizarre planet?

We have four terrestrial planets in our solar system. In addition to Earth, they are Mercury, Venus, and Mars. Those planets have smaller masses than Earth, ranging from Mercury with 5.5% of Earth’s mass to Venus with 81.5%. They also have radically different atmospheres. Venus, which is closest to Earth’s size, has an atmosphere that is 96% carbon dioxide. Mars, roughly half of Earth’s size, is 95% carbon dioxide and 2.7% nitrogen. By contrast, Earth’s atmosphere has 78% nitrogen, 21% oxygen, and less than .1% carbon dioxide.

NASA stationed an observation satellite at the Lagrange point between Earth and the Sun. That is the location where Earth’s gravity balances the Sun’s gravity. The satellite will remain stationary at roughly a million miles from Earth, gather data, and compare Earth data with information from other solar systems. It shows that Earth is the only planet we know of with abundant liquid water driving an active water cycle. 

Scientists believe life itself is responsible for much of the design of planet Earth. Earth’s vegetation has taken whatever carbon dioxide was in our atmosphere and turned it into oxygen. It is no coincidence that the Genesis account portrays plants as the first thing to appear after God created the dry land and seas. 

Another factor making Earth a unique and bizarre planet is the abundance of minerals. Earth has massive minerals of all kinds. Meteorites contain a very small number of minerals, and the Moon has more than the meteorites, but far less than Earth. The media tends to suggest that everything in space is like what we see on Earth, but the data that scientists are gathering shows that our planet is radically different. 

At the end of each day of the Genesis account, God said, “it is good” (Genesis 1:10,12, 18, 21, 25). The first chapter ends with God saying, “it is VERY good.” Over and over, the Psalms call our attention to how unique our planet is. “When I consider the heavens, the work of your fingers, the moon and the stars, which you have ordained; what is man, that you are mindful of him, and the son of man that you visit him” (Psalms 8:3-4). Psalms 19:1 adds, “The heavens declare the glory of God, and the sky shows his handiwork.” 

Our unique and bizarre planet was created by an Intelligence that shaped it into the one place that can support human life, not only in our solar system but perhaps in the entire creation.

— John N. Clayton © 2021

Reference: Astronomy magazine