Starting Tuesday, the Hubble Space Telescope will pass almost directly over St. Petersburg several nights this week.

What to look for: Heavens Above, a nonprofit satellite prediction site, says the HST will look like a bright star slowly moving from west to east.

A sweeping new study of the last crushing red tide bloom in 2018-19 suggests Tampa Bay counties should make emergency response plans and work together to clean up and offset losses.

Why it matters: That red tide created mounds of rotting fish, killed dolphins and manatees, and emptied beaches and hotels across the area.

If you're looking for a waterfront home without the waterfront price tag, here are four finds under $500K.

2424 W. Tampa Bay Blvd., Unit B211 — $315,000

Marina Club of Tampa | 2 beds, 2 baths | 1,440 square feet

• Features: Exposed brick wall, industrial feel, river views, spacious primary suite with balcony.
• Listing agent: Deborah Baigrie at Fathom Realty FL LLC

14837 Seminole Trail — $415,000

Tara Cay Sound | 3 beds, 4 baths | 2,174 square feet

• Features: Community boat dock and kayak launch, fireplace, built-ins, screened-in porch, end unit, concrete patio.
• Listing agents: Lynnea McKay and David Price Coldwell Banker Residential

8023 Tierra Verde Drive — $489,900

Temple Crest (Scaglione Sub) | 4 beds, 3 baths | 2,757 square feet

• Features: Ranch layout, panoramic river views, spacious kitchen, large closets, garage.
• Listing agent: Marie Negron at HOMM Real Estate Services

4404 Marine Pkwy — $499,000

New Port Richey | 3 beds, 2 baths | 1,905 square feet

• Features: Private beach membership ($156 annually), community amenities, new floors, new light fixtures, dual owners' closets, floating dock.
• Listing agent: Kim Claud at Keller Williams Realty

Know of an interesting or unusual home listing in the Tampa region? Email brianna.crane@axios.com.

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Warning signs have been posted along Sarasota beaches from North Jetty to Longboat Key after monitors found elevated levels of toxic algae known as Red Tide.

• There have been "reports of respiratory irritation" from beachgoers, per the Florida Department of Health in Sarasota.
• A fish kill was reported in the area, per the Florida Fish and Wildlife Conservation Commission.
• Over the past week, Karenia brevis, a naturally occurring toxic algae known as Red Tide, was detected in 54 samples in Southwest Florida, per FWC.

Why it matters: Officials are studying the water in the southern part of Tampa Bay due to the 215 million gallons of polluted water discharged weeks ago into the bay from the old Piney Point phosphate plant holding ponds.