Image (Credit): Mars Sample Return campaign poster. (NASA)
NASA and the European Space Agency are still looking for comments on the process to return Martian rock samples to Earth. Of the six steps needed to collect and return the samples (see graphic above), only the first step is currently underway with the Perseverance Rover exploring Mars. Now we need to get those samples home. You have until May 15th to get comments back to NASA on this.
And what is the time frame for getting these samples back to Earth? The current goal is 2033, assuming all goes well. You may recall that China also wants to collect and return Martian samples by 2030. I expect more delays on both sides. When you add this to the race back to the Moon, the space race is getting more interesting every day.
Image (Credit): This Hubble image is a mosaic of many exposures where some asteroids appear multiple times. (NASA, ESA, and B. Sunnquist and J. Mack/STScI)
The Hubble Space Telescope’s old data still holds some secrets. The European Space Agency (ESA) has reported that astronomers have found 1,031 unidentified asteroid trails in earlier data from the NASA/ESA Hubble Space Telescope. The asteroids were located by the Hubble Asteroid Hunter project, which defines the project in this way:
…we use archival images made by the Hubble Space Telescope to find asteroids observed by chance. The ESASky team compared the observation epoch and field of view of these images with the computed orbits of asteroids, to identify possible observations. The positions predicted by the algorithm, nevertheless, have some associated uncertainty because the ephemerides are not always known to great precision. This uncertainty increases with the amount of time between the last observation date and the date we predict the position for. Identifying the asteroids in the images (if present) and marking the exact position of their trail allows us to update the ephemerides and help us better characterise these objects.
More than 11,000 volunteers studied about 37,000 composite images taken by the Hubble between April 2002 and March 2021. The volunteers found about 1,000 asteroid trails, which when combined with other images spotted using artificial intelligence added to 1,701 asteroid trails. Of these, 1,031 are unidentified trails most likely associated with smaller asteroids. The analysis of these unidentified trails will continue.
This is a great example of the public assisting with astronomy and allowing for more timely results. It’s a helpful model for future astronomy endeavors.
Image (Credit): The nebula surrounding the star AG Carinae (ESA/Hubble and NASA, A. Nota, C. Britt)
This week’s photo is from the Hubble Space Telescope. It shows the “puffing dust bubbles and an erupting gas shell,” or nebula, surrounding the monster star AG Carinae. Here is the rest of the story from the European Space Agency (ESA) Hubble site:
This giant star is waging a tug-of-war between gravity and radiation to avoid self-destruction. The star is surrounded by an expanding shell of gas and dust — a nebula — that is shaped by the powerful winds emanating from the star. The nebula is about five light-years wide, equal to the distance from here to our nearest star, Alpha Centauri.
AG Carinae is formally classified as a Luminous Blue Variable because it is hot (blue), very luminous, and variable. Such stars are quite rare because there are not many stars that are so massive. Luminous Blue Variable stars continuously lose mass in the final stages of their life, during which a significant amount of stellar material is ejected into the surrounding interstellar space, until enough mass has been lost that the star has reached a stable state.
AG Carinae is surrounded by a spectacular nebula, formed by material ejected by the star during several of its past outbursts. The nebula is approximately 10 000 years old, and the observed velocity of the gas is approximately 70 kilometres per second. While this nebula looks like a ring, it is in fact a hollow shell rich in gas and dust, the centre of which has been cleared by the powerful stellar wind travelling at roughly 200 kilometres per second. The gas (composed mostly of ionised hydrogen and nitrogen) is visible to us in these images as a thick bright red ring, which appears doubled in places — possibly the result of several outbursts colliding into each other. The dust, here visible in blue, has formed in clumps, bubbles and filaments that are shaped by the stellar wind.
On this day in 2001, NASA’s Mars Odyssey orbiter was launched towards Mars to map and search the Red Planet for water. The mission itself took its name from Arthur C. Clarke’s novel 2001: A Space Odyssey.
The Mars Odyssey successfully discovered Martian water. Project Scientist Jeffrey Plaut of NASA’s Jet Propulsion Laboratory in Southern California, which leads the Odyssey mission, stated that “Before Odyssey, we didn’t know where this water was stored on the planet…We detected it for the first time from orbit and later confirmed it was there using the Phoenix lander.”
In addition to conducting its own studies, the Mars Odyssey was also used as a space satellite relaying data between Earth and Mars from other scientific missions, such as NASA’s Spirit and Opportunity rovers. The orbiter is part of what is called the Mars Relay Network, currently consisting of five orbiters (see below).
The Mars Odyssey is now the oldest oldest spacecraft still working at the Red Planet. It should be able to continue its work through 2025. You can find more information about the mission from this NASA site.
Image (Credit): Five spacecraft currently in orbit about the Red Planet make up the Mars Relay Network to transmit commands from Earth to surface missions and receive science data back from them. Clockwise from top left: NASA’s Mars Reconnaissance Orbiter (MRO), Mars Atmospheric and Volatile EvolutioN (MAVEN), Mars Odyssey, and the European Space Agency’s (ESA’s) Mars Express and Trace Gas Orbiter (TGO). (NASA/JPL-Caltech, ESA)
Image (Credit): The International Space Station. (NASA)
If you are standing outside in your yard looking for the International Space Station (ISS) at dawn or dusk (which is necessary to see the sun’s reflection on the station), this NASA site called Spot the Station may help. The site provides a global tracking map created by the European Space Agency (ESA) showing the current location of the ISS as well as its spot 90 minutes ago and 90 into the future.
NASA notes that the ISS circles the Earth every 90 minutes, traveling at about 17,500 miles per hour. While you experience one sunrise per day, an astronaut on the ISS will experience 16 sunrises each day.
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